From the release of January consumer price inflation data on 16 February 2016, CPIH and CPI indices have been re-referenced and published with 2015=100.
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 referenced on the same year. Re-referencing does not impact on RPI.