Time series data gives access to a comprehensive database of time series from major national statistics and social economic releases.
From September 2018, we publish the main factors contributing to the differences between the unrounded inflation rates for the CPIH and the RPI.
These differences are broken down into:
mortgage interest payments
other housing components excluded from the CPIH
imputed rents (included in CPIH and excluded from RPI)
other differences in the coverage of goods and services
the formula effect
The final component titled “other differences including weights” is derived as a residual. These series are published as Table 5a in the Consumer price inflation dataset while the corresponding figures for the Consumer Prices Index (CPI) can be found in Table 5b.
Full historic series for each of the re-referenced indices are now available for users to view or download.
Regular re-referencing of indices is methodological good practice as it avoids rounding issues that can arise from small index values.
Please note that re-referencing does not impact on published inflation rates, although when using the indices to calculate to calculate inflation rates, it is important to use indices that are calculated in the same reference year. Re-referencing does not impact on RPI.