In England, the Retail Prices Index adjustment is applied to a pitch fee review. In Wales, the Consumer Price Index (CPI) is applied. It is calculated by using the last figure that was published, 28 days before the review date. For example if the review date is 1 April, 2014, the latest figure prior to 4 March will be used.
Note that this can mean old RPI (or CPI in Wales) figures are used if the review is late. For example, if the review date is 1 April, but the review is done late on 1 July, then the figure used will still be the one from 4 March (28 days before the review date of 1 April).