Second Estimate of GDP: Quarter 2 (Apr to June) 2015

The second quarterly estimate of GDP based on additional data but produced later than the preliminary estimate, providing a more precise indication of economic growth.

Nid hwn yw'r datganiad diweddaraf. Gweld y datganiad diweddaraf

Cyswllt:
Email Matthew Hughes

Dyddiad y datganiad:
28 August 2015

Cyhoeddiad nesaf:
30 September 2015

1. Main points

  • UK GDP in volume terms was estimated to have increased by 0.7% between Quarter 1 (Jan to Mar) 2015 and Quarter 2 (Apr to June) 2015, unrevised from the previous estimate of GDP published 28 July 2015

  • GDP was estimated to have increased by 3.0% in 2014, compared with 2013, unrevised from the previously published estimate

  • Between Quarter 2 2014 and Quarter 2 2015, GDP in volume terms increased by 2.6%, unrevised from the previously published estimate

  • GDP in current prices was estimated to have increased by 0.7% between Quarter 1 2015 and Quarter 2 2015

  • GDP per head in volume terms was estimated to have increased by 0.5% between Quarter 1 2015 and Quarter 2 2015. Between 2013 and 2014, GDP per head increased by 2.3%

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2. Understanding GDP

Change in GDP is the main indicator of economic growth. There are 3 approaches used to measure GDP.

Gross value added (GVA) is the sum of goods and services produced within the economy less the value of goods and services used up in the production process (intermediate consumption). The output approach measures GVA at a detailed industry level before aggregating to produce an estimate for the whole economy. GDP (as measured by the output approach) can then be calculated by adding taxes and subtracting subsidies (both only available at whole economy level) to this estimate of total GVA (more information on creating the preliminary estimate of GDP is available on the methods and sources page of our website).

The income approach measures income generated by production in the form of gross operating surplus (profits), compensation of employees (income from employment) and mixed income (self-employment income) for the whole economy.

The expenditure approach is the sum of all final expenditures within the economy, that is, all expenditure on goods and services that are not used up or transformed in the process, that is, final consumption (not intermediate) for the whole economy.

The second estimate of GDP is based on revised output data, together with data from some expenditure and income components. The output GVA and GDP estimates are balanced with the equivalent income and expenditure approaches to produce headline estimates of GVA and GDP. Further information on all 3 approaches to measuring GDP can be found in the Short Guide to National Accounts (105.5 Kb Pdf).

All data in this bulletin are seasonally adjusted estimates and have had the effect of price changes removed (in other words, the data are deflated), with the exception of income data which are only available in current prices.

Growth for GDP and its components is given between different periods. Latest year-on-previous-year gives the annual growth between one calendar year and the previous. Latest quarter-on-previous-quarter growth gives growth between one quarter and the quarter immediately before it. Latest quarter-on-corresponding-quarter-of-previous-year shows the growth between one quarter and the same quarter a year ago.

In line with national accounts revisions policy, the only period open for revision in this release is Quarter 2 (Apr to June) 2015.

About the Second Estimate of GDP

The second estimate of GDP is produced around 7 and a half weeks after the end of the quarter to provide a timely estimate of GDP. At this stage the data content of this estimate from the output measure of GDP has risen to around 80% of the total required for the final output based estimate. There is also around 50 to 60% data content available to produce estimates of GDP from the expenditure and income approaches.

The quality of the GDP estimate

Revisions are an inevitable consequence of the trade-off between timeliness and accuracy. The estimate is subject to revisions as more data become available, but between the preliminary and third estimates of GDP, revisions are typically small (around 0.1 to 0.2 percentage points), with the frequency of upward and downward revisions broadly equal.

All estimates, by definition, are subject to statistical uncertainty and for many well-established statistics we measure and publish the sampling error associated with the estimate, using this as an indicator of accuracy. The estimate of GDP, however, is currently constructed from a wide variety of data sources, some of which are not based on random samples and as such it is very difficult to measure the sampling error. While development work continues in this area, like all other G7 national statistical institutes, we do not publish a measure of the sampling error associated with GDP.

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3. Headline GDP and selected components

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4. Historical context

Figure 1: Quarterly growth and levels of UK GDP, table A2

Quarter 1 (Jan to Mar) 2003 to Quarter 2 (Apr to Jun) 2015

Figure 1: Quarterly growth and levels of UK GDP, table A2

Source: Office for National Statistics
Notes:
  1. Q1 is Quarter 1 (Jan to March)

As seen in Figure 1, GDP in the UK grew steadily during the 2000s until a financial market shock affected UK and global economic growth in 2008 and 2009. Economic growth resumed towards the end of 2009, but at a slower rate than the period prior to 2008. From the peak in Quarter 1 (Jan to Mar) 2008 to the trough in Quarter 2 (Apr to June) and Quarter 3 (July to Sept) 2009, GDP decreased by 6.0%. This can be compared to previous economic downturns in the early 1980s and early 1990s, which saw lower levels of impact on GDP. In the early 1990s downturn, GDP decreased by 2.2% from the peak in Quarter 2 (Apr to June) 1990 to the trough in Quarter 3 (July to Sept) 1991. In the early 1980s downturn, GDP decreased by 5.6% from the peak in Quarter 2 (Apr to June) 1979 to the trough in Quarter 1 (Jan to Mar) 1981.

From Quarter 3 (July to Sept) 2009 growth continued to be erratic, with several quarters between 2010 and 2012 recording broadly flat or declining GDP. This two-year period coincided with special events (for example severe winter weather in Quarter 4 (Oct to Dec) 2010 and the Diamond Jubilee in Quarter 2 (Apr to June) 2012 that are likely to have affected growth both adversely and positively. Since 2013, GDP has grown steadily, with the economy exceeding pre-downturn peak levels in Quarter 3 (July to Sept) 2013.

Quarter 2 (Apr to June) 2015 has shown continued strength with GDP growing by 0.7% compared with the previous quarter; by 2.6% between Quarter 2 (Apr to June) 2014 and Quarter 2 (Apr to June) 2015, and by 3.0% between 2013 and 2014. GDP has now increased for 10 consecutive quarters, breaking a pattern of slow and erratic growth from 2009.

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5. GDP analysed by output categories, chained volume measures, tables B1 and B2

Annex A - growth and contributions to growth of output components (29.5 Kb Excel sheet) contains output component growth rates back to Quarter 1 (Jan to Mar) 2014.

The output components of GDP showed increases in Quarter 2 (Apr to June) 2015 for construction and services. Production components showed both increases and decreases but there was overall growth in total production. There were decreases for agriculture, forestry and fishing.

Production output increased by 0.7% in Quarter 2 2015 compared with Quarter 1 2015, revised down 0.3 percentage points from the previously published estimate. Within the production sub-industries, output from mining and quarrying, including oil and gas extraction, rose by 6.1%; manufacturing (the largest component of production) decreased by 0.3% (Figure 2), while electricity, gas, steam and air conditioning supply industries fell by 3.1%. Evidence from the Department of Energy and Climate Change (DECC) suggested the recent tax changes announced in the March budget could be a contributing factor to the rise in mining and quarrying. Water supply and sewerage rose by 3.0%.

When comparing Quarter 2 (Apr to June) 2015 with Quarter 2 (Apr to June) 2014, production output increased by 1.4%, revised down 0.4 percentage points from the previously published estimate. Manufacturing increased by 0.6% between these periods while electricity, gas, steam and air conditioning supply industries decreased by 0.5%. Mining and quarrying, including oil and gas extraction, increased by 5.2% while water supply and sewerage increased by 4.0%.

Construction output increased by 0.2% in Quarter 2 (Apr to June) 2015, revised up 0.2 percentage points from the previously published estimate. Construction output increased by 2.5% between Quarter 2 (Apr to June) 2014 and Quarter 2 (Apr to June) 2015, revised up 0.3 percentage points from the previously published estimate.

The service industries grew by 0.7% in Quarter 2 (Apr to June) 2015 (as shown in Figure 3), unrevised from the previous estimate, marking the tenth consecutive quarter of positive growth. This follows a 0.4% increase in Quarter 1 (Jan to Mar) 2015.

Output of the distribution, hotels and restaurants industries increased by 1.0% in Quarter 2 (Apr to June) 2015, following a 1.1% increase in Quarter 1 (Jan to Mar) 2015. The increase in the latest quarter was largely due to wholesale and retail trade and repair of motor vehicles and motorcycles.

Output of the transport, storage and communication industries increased by 1.2% in Quarter 2 (Apr to June) 2015, following a 0.7% increase in Quarter 1 (Jan to Mar) 2015. The largest contributor to the increase was computer programming, consultancy and related activities.

Business services and finance industries’ output rose by 0.8% in Quarter 2 (Apr to June) 2015, following a 0.1% increase in Quarter 1 (Jan to Mar) 2015. The largest upward contribution to growth in Quarter 2 (Apr to June) 2015 came from legal activities.

Output of government and other services increased by 0.2% in Quarter 2 (Apr to June) 2015, following a 0.3% increase in Quarter 1 (Jan to Mar) 2015. In the latest quarter the largest upward contribution came from human health activities.

Further detail on the service industries’ lower level components can be found in the Index of Services statistical bulletin published on 28 August 2015.

Gross value added (GVA), excluding oil and gas extraction, increased by 0.5% in Quarter 2 (Apr to June) 2015 following a 0.4% increase in Quarter 1 (Jan to Mar) 2015.

Figure 4 shows the path of GDP and its headline industries (this excludes agriculture, and includes manufacturing which is a sub-component of production) relative to their level of output achieved in Quarter 1 (Jan to Mar) 2008.

In the decade prior to the downturn, the services industry grew steadily, while production output was broadly flat over the same period. Construction activity grew strongly in the early part of the decade, and although there was a temporary decline in the mid-2000s - this was reversed by the end of 2007.

Industries have shown differing trends following the recent economic downturn. The construction, manufacturing, and production industries were more acutely affected by the deterioration in economic conditions, with output falling from peak to trough by 17.1%, 12.2% and 10.7% respectively. In contrast, output in the services industry only fell by 4.0% from its peak to trough.

Production activity began to grow again in 2010, and the manufacturing and the construction industries showed particular strength, however neither industry sustained this growth. Production output fell in both 2011 and 2012, falling below levels seen at the depth of the downturn in 2009. Construction output also fell sharply in 2012, with output falling close to its 2009 trough after further contraction in Quarter 1 (Jan to Mar) 2013. Construction output improved over much of 2014. Although, there has been widespread growth across all major components of GDP since the start of 2013, the service industry remains the largest and steadiest contributor to overall economic growth, and is the only headline industry in which output has exceeded pre-downturn levels.

Figure 5 shows the average compound quarterly growth rate experienced over the 5 years prior to the economic downturn in 2008 to 2009, the average growth rate experienced between Quarter 3 (July to Sept) 2009 and Quarter 2 (Apr to June) 2014 (5 years following the downturn), and the current quarterly growth rate observed in the most recent period (Quarter 2 2015). Compound average growth is the rate at which a series would have increased or decreased if it had grown or fallen at a steady rate over a number of periods. This allows the composition of growth in the recent economic recovery to be compared to the long run average.

The UK experienced slightly slower average compound GDP growth in the 5 years following the economic downturn compared with the 5 years prior: this is also true of the services industry. Figure 5 shows that in Quarter 2 (Apr to June) 2015, all industries shown underperformed compared to the post-downturn average rate of growth, with the exception of production which has increased by 0.7% in the most recent quarter. The accommodation and food services industries have shown particular strength when compared to both the production 5 year average, prior and post downturn.

It should be noted that the third column, which shows the current quarterly growth rate, is based on only 1 data point. Consequently users should use caution when making direct comparisons with the long run averages.

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6. GDP analysed by expenditure categories, chained volume measures, table C2

Annex B - growth and contributions to growth of expenditure components (33.5 Kb Excel sheet) contains expenditure component growth rates back to Quarter 1 (Jan to Mar) 2014.

Gross domestic expenditure (the sum of all expenditure by UK residents on goods and services that are not used up or transformed in a productive process) fell by 0.3% in Quarter 2 (Apr to June) 2015. Annually, between 2013 and 2014 gross domestic expenditure increased by 3.5%.

Household final consumption expenditure increased by 0.7% in Quarter 2 (Apr to June) 2015, and has increased for 16 consecutive quarters (Figure 6). The largest increase in household final consumption expenditure in Quarter 2 (Apr to June) 2015 came from miscellaneous goods. When compared with the same quarter a year ago, household final consumption expenditure has been rising each quarter since Quarter 4 (Oct to Dec) 2011, and was 3.3% higher in Quarter 2 2015 than in the same period a year ago. Between 2013 and 2014, household final consumption expenditure increased by 2.6%.

Government final consumption expenditure increased by 0.9% in Quarter 2 (Apr to June) 2015, following a 0.9% increase in Quarter 1 (Jan to Mar) 2015. Between Quarter 2 (Apr to June) 2014 and Quarter 2 (Apr to June) 2015, government final consumption expenditure increased by 1.9%. Between 2013 and 2014, government final consumption expenditure increased by 1.6%.

Non-profit institutions serving households’ (NPISH) final consumption expenditure rose by 0.5% in Quarter 2 (Apr to June) 2015, following a 2.6% rise in Quarter 1 (Jan to Mar) 2015. Between Quarter 2 (Apr to June) 2014 and Quarter 2 (Apr to June) 2015, NPISH final consumption expenditure increased by 1.0%. Annually, NPISH final consumption expenditure increased by 0.9% between 2013 and 2014.

In Quarter 2 (Apr to June) 2015, gross fixed capital formation (GFCF) was estimated to have increased by 0.9% (Figure 7). Between Quarter 2 (Apr to June) 2014 and Quarter 2 (Apr to June) 2015, GFCF increased by 4.9%. GFCF increased by 8.6% between 2013 and 2014.

In Quarter 1 (Jan to Mar) 2015, we migrated to the Quarterly Acquisitions and Disposals of Capital Assets Survey (QCAS) from the Quarterly Survey of Capital Expenditure (CAPEX) as one of the main data sources for GFCF. The main reasons for the changes to the survey are to move to the updated European System of Accounts (ESA) 2010 manual, the international guidance for national accounts. More information on this change and more detail on GFCF can be found in the Business Investment statistical bulletin, published on 30 June 2015.

Business investment was estimated to have risen by 2.9% in Quarter 2 (Apr to June) 2015. Between Quarter 2 (Apr to June) 2014 and Quarter 2 (Apr to June) 2015, business investment increased by 5.0%. Annually, business investment increased by 8.0% between 2013 and 2014.

Including the alignment adjustment, the level of inventories decreased by £2.3 billion in Quarter 2 (Apr to June) 2015, following an increase of £2.5 billion in Quarter 1 (Jan to Mar) 2015. More information on the alignment adjustment can be found in the Balancing GDP section within the Background Notes of this release.

The trade balance deficit narrowed from £13.4 billion in Quarter 1 (Jan to Mar) 2015 to £9.1 billion in Quarter 2 (Apr to June) 2015 (Figure 8). The trade position reflects exports minus imports. Following a 0.4% increase in Quarter 1 (Jan to Mar) 2015, exports increased by 3.9% in the latest quarter, while imports increased by 0.6% following a 2.3% increase in Quarter 1 (Jan to Mar) 2015. Between 2013 and 2014, exports increased by 0.5%, while imports increased by 2.4%.

Figure 9 shows the quarterly contribution of the expenditure components to the growth of GDP in chained volume measures. For Quarter 2 2015, the largest positive contribution to GDP came from net trade, which contributed 1.0 percentage points. Household final consumption expenditure contributed 0.4 percentage points to GDP; general government final consumption expenditure contributed 0.2 percentage points and NPISH contributed 0.0 percentage points. The only negative contributions to GDP came from gross capital formation which contributed a negative 0.9 percentage points.

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7. GDP implied deflator

Annex D - growth and contributions to growth - implied GDP deflators (31.5 Kb Excel sheet) contains implied deflator component growth rates back to Quarter 1 (Jan to Mar) 2014.

The GDP implied deflator at market prices for Quarter 2 (Apr to June) 2015 is 0.8% above the same quarter of 2014 (Figure 10). The GDP implied deflator is calculated by dividing current price (nominal) GDP by chained volume (real) GDP and multiplying by 100 to convert to an index. It is not used in the calculation of GDP; the deflators for expenditure components, which are the basis for the implied GDP deflator, are used to calculate nominal GDP, not real GDP.

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8. GDP analysed by income categories at current prices, table D

Annex C - growth and contributions to growth of income components (22 Kb Excel sheet) contains income component growth rates back to Quarter 1 (Jan to Mar) 2014.

GDP at current market prices increased by 0.7% in Quarter 2 (Apr to June) 2015, following a 0.7% increase in Quarter 1 (Jan to Mar) 2015. GDP at current market prices increased by 3.4% when compared to Quarter 2 (Apr to June) 2014. In 2014, GDP at current market prices increased by 4.6%.

Compensation of employees, which includes both wages and salaries, and pension contributions, increased by 2.1% in Quarter 2 (Apr to June) 2015, following a decrease of 0.5% in Quarter 1 (Jan to Mar) 2015 (Figure 11). Between Quarter 2 (Apr to June) 2014 and Quarter 2 (Apr to June) 2015, compensation of employees increased by 4.1%. Between 2013 and 2014, compensation of employees rose by 3.1%.

The gross operating surplus of corporations (effectively the profits of companies operating within the UK), including the alignment adjustment, fell by 2.3% in Quarter 2 (Apr to June) 2015 compared with the previous quarter; this follows an increase of 3.5% in Quarter 1 (Jan to Mar) 2015 (Figure 12). Between 2013 and 2014 the gross operating surplus of corporations rose by 5.6%. More information on the alignment adjustment can be found in the Balancing GDP section within the Background Notes of this release.

Taxes less subsidies on products and production increased by 3.7% in Quarter 2 (Apr to June) 2015, following a decrease of 2.7% in Quarter 1 (Jan to Mar) 2015. Between 2013 and 2014 taxes less subsidies on products and production increased by 4.8%.

Figure 13 shows the contribution made by income components to current price GDP. In Quarter 2 (Apr to June) 2015, there were positive contributions to GDP from compensation of employees and taxes less subsidies, they contributed 1.0 and 0.4 percentage points respectively. Gross operating surplus of corporations contributed a negative 0.5 percentage points to GDP while other income contributed a negative 0.2 percentage points.

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9. GDP per head, table P

In Quarter 2 (Apr to June) 2015 GDP per head increased by 0.5% compared with Quarter 1 (Jan to Mar) 2015. In Quarter 2 (Apr to June) 2015 GDP per head was only 0.1% below its pre-economic downturn peak level (Quarter 1 (Jan to Mar) 2008), while GDP exceeded the level of its pre-downturn peak in Quarter 3 (July to Sept) 2013, and in Quarter 2 (Apr to June) 2015 was 5.2% above its pre-downturn peak (Figure 14).

Between Quarter 2 (Apr to June) 2015 and Quarter 2 (Apr to June) 2014, GDP per head increased by 1.9%. Between 2013 and 2014, GDP per head increased by 2.3%.

GDP per head is calculated by dividing GDP in chained volume measures by the latest population estimates and projections. The population estimates and projections used in this release are those published on 26 June 2014.

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10. International comparisons for Quarter 2 (Apr to June) 2015

The estimates quoted in this international comparison section are the latest available estimates published by the respective bodies (referenced) at the time of preparation of this statistical bulletin and may subsequently have been revised.

All areas included within our international comparison, with the exception of Japan, saw positive growth when comparing Quarter 1 (Jan to Mar) 2015 and Quarter 2 (Apr to June) 2015 (Figure 15). The European Union (EU28) grew by 0.4% in the second quarter of 2015 marking 9 consecutive quarters of positive growth (Table 2). In the same period, the eurozone (EA19) expanded by 0.3%. When comparing Quarter 2 2014 with Quarter 2 2015, EA19 grew by 1.2 % whilst the EU28 expanded by 1.6% (Figure 16).

Germany saw its GDP increase by 0.4% between Quarter 1 2015 and Quarter 2 2015, up 0.1 percentage points from the previous quarter-on-quarter growth. In contrast, GDP for France was unchanged between Quarter 1 2015 and Quarter 2 2015, following a 0.7% increase in the previous quarter.

In the second quarter of 2015 the USA’s economy increased by 0.9%. Between Quarter 2 2014 and Quarter 2 2015, GDP for the USA increased by 2.7%. GDP for Japan decreased by 0.4% in Quarter 2 2015, following a 1.1% increase in the previous quarter. Although between Quarter 2 2014 and Quarter 2 2015, Japan’s economy grew by 0.7%.

GDP for the Group of Seven (G7) countries increased by 0.3% in Quarter 1 2015, following a 0.4% increase in the previous quarter. When comparing Quarter 2 2014 with Quarter 2 2015, G7 GDP increased by 1.8% and is now 5.4% above its pre-recession peak in Quarter 1 2008.

Figure 17 shows GDP for the UK, EU, the USA and Japan, all indexed to Quarter 1 2008 (the pre-downturn peak in the UK) to allow comparison of each since that period.

More detailed information on these estimates can be found on the Eurostat website. Information on the estimates for the USA can be found on the Bureau of Economic Analysis website; information on the estimates for Japan can be found on the Japanese Cabinet Office website while information for the G7 countries can be found on the Organisation for Economic Co-operation and Development’s website.

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11. Quarterly revisions

GDP and components, previously published on 28 July 2015

Figure 18 shows quarterly revisions between latest and previously published estimates of GDP. The earliest period open for revision in this release is Quarter 2 (Apr to June) 2015.

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.Background notes

  1. What do you think?

    We would welcome your feedback on this publication. If you would like to get in touch please contact us via email: gdp@ons.gov.uk

  2. Release policy

    This release includes data available up to 19 August 2015. Data are consistent with the Index of Production statistical bulletin published on 6 August 2015, the current price trade in goods data within the UK Trade statistical bulletin published on 7 August 2015 and the population estimates published 26 June 2014.

  3. Construction industry

    On 11 December 2014, the UK Statistics Authority announced its decision to suspend the designation of Construction Price and Cost Indices (CPCIs) due to concerns about the quality of these deflators. As a result, the UK Statistics Authority also suspended the designation of Output and New Orders as National Statistics in respect of the Code of Practice for Official Statistics.

    We took over responsibility for the publication and development of the CPCIs from the Department for Business Innovation and Skills on 1 April 2015. On 8 May 2015, we published an article describing the proposed interim solution for construction price and cost indices (CPCIs) (254.5 Kb Pdf) to replace the statistical models that had been used in the production of chained volume measures (CVMs) for output in the construction industry since Quarter 3 (July to Sept) 2014 and to provide an ongoing source of data from Quarter 2 (Apr to June) 2015 onwards. This interim solution is used within this release.

    The change in methodology for the CPCIs resulted in revisions to output in the construction industry (214.3 Kb Pdf) . However, users should note that this is not the sole source of revisions. The incorporation of late data and new seasonal adjustment parameters has also contributed to the revisions to output in the construction industry.

  4. Release content and context

    This release includes the second estimate of GDP. Data content for each successive release of GDP varies according to availability.

    The Preliminary Estimate of GDP is based on output data alone. These are based on survey estimates for the first 2 months of the quarter with estimates for the third month of the quarter based on forecasts using early returns from businesses. Other (non-survey based) data used in the compilation of the output approach are also based on forecasts.

    For the Second Estimate of GDP output estimates, based on survey data, are available for all 3 months of the quarter, in addition to other significant data sources. Estimates of the expenditure and income approaches to measuring GDP are also available in this release based on a combination of limited survey data, other data sources and forecasts.

    For the Quarterly National Accounts (QNA) release, output survey data are available for all 3 months of the quarter, along with most other data sources. For the expenditure and income approaches to measuring GDP, more extensive survey data are available, in addition to other data sources and a more limited use of forecasts.

    After this release, the current quarter will be subject to revision in accordance with National Accounts revisions policy as further data, annual benchmarks and methodological improvements are implemented. More information on the annual data and benchmarks included in this release can be found in the Quarterly Revisions section of this bulletin.

    We have produced a short guide to the UK National Accounts (136.8 Kb Pdf) to give more information on the principles of national accounting and the various publications available.

  5. Blue Book 2015 changes

    In September 2015, we will publish revised figures for the UK national accounts, including GDP and balance of payments.

    Changes will be made in line with international standards adopted by all European Union (EU) member states and with worldwide best practice. These, and additional improvements we are making, will ensure that our national accounts continue to provide a reliable framework for analysing the UK economy and comparing it with other countries.

    The improvements made in September 2015 can be split into 3 categories:

    • methodological improvements introduced through the European System of Accounts 1995 (ESA95); these are also known as gross national income (GNI) reservations
    • classification changes, under the new ESA2010 international standards are planned to be incorporated into the National Accounts in Blue Book 2015
    • other regular improvements and methodological changes

    We are publishing a series of articles in the lead up to the publication which can be found on the Blue Book and Pink Book 2015 Changes page.

  6. National Statistics Quality Review

    In line with the recently published National Statistics Quality Review (NSQR): Review of National Accounts and Balance of Payments, we have published a National Accounts and Balance of Payments response (570.9 Kb Pdf) , which can be found on our website.

  7. National Accounts Work Plan 2015 to 2018

    On 13 July 2015 users of national accounts were invited to respond to an informal consultation on the national accounts work plan which lays out a proposed set of priorities for the next 3 years. In response to a request to extend the deadline of the consultation on the National Accounts Work Plan, we are happy to accommodate and will therefore be extending the deadline to 25 September 2015. It follows a previous work plan for national accounts and related outputs following the consultation held in 2013.

  8. Special Events

    We maintain a list of special events in the Special Events Calendar. Special events are events that are identifiable; they do not recur on a regular cycle (so are not targeted by seasonal adjustment) and have at least the potential to have an impact on statistics. As explained in our Special Events policy, it is not possible to separate the effects of special events from other changes in the series.

  9. Continuous improvement of GDP: sources, methods and communication

    The UK Statistics Authority published 2 new assessment reports on the Annual and Quarterly National Accounts and Supply and Use Tables and Input-Output Tables on 25 February 2015. These are available on the UK Statistics Authority website.

    In order to implement improvements reflected in the European System of Accounts 2010 (ESA2010), we will introduce a new survey to collect purchases data, and have published an National Accounts article detailing our intentions along with a high level project plan.

  10. National accounts methodology and articles

    We regularly publish methodological information and articles to provide more detailed information on developments within the national accounts. This includes; supplementary analyses of data to help users with the interpretation of statistics and guidance on the methodology used to produce the national accounts.

  11. National accounts classification decisions

    The UK national accounts are produced under internationally agreed guidance and rules set out principally in the European System of Accounts (ESA 2010) and the accompanying Manual on Government Deficit and Debt- Implementation of ESA 2010 – 2014 edition (MGDD).

    In the UK, we are responsible for the application and interpretation of these rules. Therefore we make National Accounts classification decisions based upon the agreed guidance and rules, and these are published on our website.

  12. Economic context

    We publish a monthly Economic Review discussing the economic background, giving economic commentary on the latest GDP estimate and our other economic releases. The next article will be published on 3 September 2015.

  13. Basic quality information for GDP statistical bulletin

    A Quality and Methodology Information report (518.9 Kb Pdf) for this statistical bulletin can be found on our website.

  14. Important quality issues

    Common pitfalls in interpreting series:

    • expectations of accuracy and reliability in early estimates are often too high
    • revisions are an inevitable consequence of the trade-off between timeliness and accuracy
    • early estimates are based on incomplete data

    Very few statistical revisions arise as a result of "errors" in the popular sense of the word. All estimates, by definition, are subject to statistical "error" but in this context the word refers to the uncertainty inherent in any process or calculation that uses sampling, estimation or modelling. Most revisions reflect either the adoption of new statistical techniques or the incorporation of new information which allows the statistical error of previous estimates to be reduced. Only rarely are there avoidable "errors" such as human or system failures and such mistakes are made quite clear when they do occur

  15. Reliability

    Estimates for the most recent quarters are provisional and are subject to revision in the light of updated source information. We currently provide an analysis of past revisions in the GDP and other statistical bulletins that present time series.

    Our revisions to economic statistics page brings together our work on revisions analysis, linking to articles, revisions policies and key documentation from the Statistics Commission's report on revisions.

    Revisions to data provide one indication of the reliability of main indicators. Tables 3 and 4 show summary information on the size and direction of the revisions that have been made to data covering a five-year period. A statistical test has been applied to the average revision to find out if it is statistically significantly different from zero. An asterisk (*) shows if the result of the test is significant.

  16. Revisions to GDP estimates

    Table 3 shows the revisions to month 1 (preliminary) and month 2 (second) estimates of GDP. The analysis of revisions between month 1 and month 2 uses month 2 estimates published from August 2010 (Quarter 2 2010) to May 2015 (Quarter 1 2015). The analysis of revisions between month 2 and month 3 (third estimate of GDP) uses month 3 estimates published from June 2010 (Quarter 1 2010) to March 2015 (Quarter 4 2014).

    Table 4 shows the revisions to GDP growth between the estimate published 3 months after the end of the quarter and the equivalent estimate 3 years later. The analysis uses month 3 estimates first published from June 2007 (Quarter 1 2007) to March 2012 (Quarter 4 2011) for GDP.

    Revisions triangles for the main components of GDP from expenditure, output and income approaches and spreadsheets, containing revisions triangles (real time databases) of estimates from 1992 to date and the calculations behind the averages in both tables are available on our website.

    An article titled "Revisions to GDP and components (513.5 Kb Pdf)", published on 28 January 2014, is available on our website.

  17. Balancing GDP

    Information on the methods we use for balancing the output, income and expenditure approaches to measuring GDP can be found on our website.

    The different data content of the 3 approaches dictates the approach taken in balancing quarterly data. In the UK, there are far more data available on output than in the other 2 approaches. However, in order to obtain the best estimate of GDP (the published figure), the estimates from all 3 approaches are reconciled to produce an average.

    Annually, the estimates from all three approaches are reconciled through the creation of Input-Output Supply and Use tables for the years for which data are available.

    For years in which there is no Supply and Use balance, a Statistical Discrepancy exists that reflects the differences between the published headline estimate of GDP and the expenditure and income estimates.

    For all periods, the expenditure and income estimates are aligned to the published headline GDP figure. Although annual data is aligned for balanced years, there will still be quarterly differences for balanced and post balanced years, due to timing and data content issues. These are dealt with by means of explicit alignment adjustments that are applied to specific components (gross operating surplus of private non-financial corporations in the income approach and changes in inventories in expenditure) to align the 3 approaches. As these are purely quarterly discrepancies, the alignments sum to zero over the year and are published explicitly in the GDP statistical bulletins. They are also published as “of which” items within the specific components, to enable users to ascertain the underlying picture.

    Alignment adjustments have a target limit of plus or minus £2,000 million on any quarter. However, in periods where the data sources are particularly difficult to balance, slightly larger alignment adjustments are sometimes needed.

    The size and direction of the quarterly alignment adjustments in Quarter 2 (Apr to June) 2015 indicate that in this quarter the level of both expenditure and income were higher than that of output.

  18. Further information

    Latest copies of this and our other releases are available under Publications on our website.

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  21. Details of the policy governing the release of new data are available by visiting www.statisticsauthority.gov.uk/assessment/code-of-practice/index.html or from the Media Relations Office email: media.relations@ons.gov.uk

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Nôl i'r tabl cynnwys

. Methodology

Manylion cyswllt ar gyfer y Bwletin ystadegol

Matthew Hughes
gdp@ons.gov.uk
Ffôn: +44 (0)1633 455827