It is the retail prices index that excludes the volatile energy cost and food items.
The index calculation unadjusted for the highly volatile components allows for the correct estimation of inflation rate changes for an accounting period.
Вплив на ринок
The index growth or the actual value rise exceeding the forecast is a positive sign for the British Pound.
Since the retail prices index is released together with more important country’s inflation indicator (consumer price index), its influence on the British Pound dynamics is limited.