but what legal standing does a pamphlet have?
Where are our "legal" T&C s anyway? AF Pensions acts? QRs?
Not an expert on this, but pending expert answers, the authority is the Armed Forces Pension Scheme 2005 or the 1975 Scheme as appropriate. AFPS 05 has a read across to the Pensions (Increase) Act 1971 for the method of adjustment for inflation.
I suspect the pamphlet referred to is only a statement of the position on the date when it is produced.