Rotorspeed -
Commercial - zero if self funded. I believe the Bristow/Air League sponsorship from earlier this year specified at least an A/1 in GCSE/Standard Grade maths, which was the cause of some consternation at the time!
RAF - "2 A-levels (at grade A-C) or 3 Highers or equivalent, plus 5 GCSE/SCEs at Grade C/2 minimum or equivalent including English language and grade B/1 in maths."