what is an example of the rpi vs cpi 
due to the varying inputs to both indexes the inflation rate calculations differ significantly in may 2023 the cpi was 8 7 and the rpi was 11 4 the ons in the u k lists the rpi as not a national statistic 1the bottom linethe retail price index rpi is calculated and published by the office of national statistics in the united kingdom the consumer prices index cpi replaced the rpi in 2003 as the statistical measure of inflation in the u k the rpi is considered a legacy measure since its formula is no longer updated or recalculated but continues to be included on the ons website 