It's not a topic which was limited to Spec Aircrew, although clearly the flying pay element of a Spec Aircrew Flt Lt is very significant. The issue was that if you're paid and taxed £XXX, your pension should also be based on £XXX, not £(XXX - FP).
When I was promoted to Sqn Ldr Spec Aircrew, although I found myself suddenly receiving the same basic pay as a Single List 8 year Sqn Ldr, my total pay was only a few pennies different to its previous level due to the flying pay element having been reduced. Which at least improved the pensionable element....
Those who were at Cartoontown International at the time will recall that 'Rumpole' put a lot of effort into the topic, but was ultimately unsuccessful.