Important notes and usage information
Time series data gives access to a comprehensive database of time series from major national statistics and social economic releases.
From December 2018, the historical weights data for CPIH and CPI are available for users to view or download.
Revisions to CPI
We have published an extended series for CPIH from 1988 to 2004. The CPIH is the same as CPI but includes a measure of owner occupiers’ housing costs and Council Tax.
In developing the series we identified an error in the calculation of the modelled CPI historic series. This does not affect the CPI National Statistic series from 1997 on.
The affected part of the series is between 1988 and 1996, which was modelled after the live implementation of CPI in 1997. There are 10 revisions to the headline rate, with a maximum revision of 0.2 percentage points.
The revisions at the next level (Division) are somewhat larger with revisions of up to 2.7 percentage points in the Health division in 1996. Elsewhere revisions do not exceed 0.9 percentage points. The most affected divisions are Housing, Water, Gas, Electricity and Other Fuels, Food and Non-Alcoholic Beverages, and Alcoholic Drinks.
Due to the historical nature of the series we have been unable to identify the cause of the error; however, we have carried out a number of checks to ensure that the revised estimates are correct.