I've just had a go on the Pension Calculator and I must admit it seems a decent bit of kit for once. The figures it churned out for AFPS05 were very similiar to those I had worked out using a spreadsheet/back of a fag packet.
However, there seems to be one small glitch - I haven't yet moved onto the PAS, but if I enter my 38/16 point at the entry to PAS date (i.e. in the future) and run the calculation it appears to use the Spec Aircrew daily supplement (currently 52.3p per day for navs) instead of the full Flt Lt PAS rate (currently 86.0p per day for navs). As a result, by my figures, it underestimates my pension on AFPS75 at 55 by some £2100.
D4R