The thrust of the arguement was, if it's taxable income, which flying pay (additional pay) was, then it must be pensionable - MoD and Treasury refused to entertain this basic premis
A very few Snr O's employed QC's and got out of court settlements
The SIntO at ISK, circa 1984, pushed hard on this reckoning on £25k+ due to him, although through tax rules, he could probably only go back 7 yrs
The MoD saw a major problem and fought it to stall it
A Nav pal at the same, Steve Rooke (RIP), also fought this and was pulled aside and told to stop making waves or else!
Now with Spined and Spineless aircrew there is no flg pay, as it's additional pay (always was) which is included with basic pay, so it's all taxable and all pensionable
Everyone is now better off except those that left earlier