The CPI increase which will come into force next April has been announced as 3.1% by the ONS. This is the figure that will be used to increase all Armed Forces pensions in payment from April 2022.
Armed Forces pensions, once awarded, are adjusted in April each year by the Consumer Price Index (CPI). The CPI rate used is the CPI headline rate for the September prior to the April adjustment the following year. This rate is always formally announced in October.