Assuming Red Line Entrys' figures are correct, and that the RAF has 600 aircraft (probably too many!) then each individual aircraft can have an engineering team which includes:
1/2 Wg Cdr engineer
1 Sqn Ldr engineer
1 Flt Lt engineer
I also thought that the Eng Branch was an inverted pyramid at one level, with more Sqn Ldr Engineers than Flt Lts, it certainly used to be!!