If you feel the need to prove something to yourself then crack on dear boy. Otherwise, if you have achieved the required standard, join up as quickly as you can and start enjoying the life. Most of us come from an era when no-one did more than 3 A-levels (4 if you did extra maths or had a home tutor). In 5 years' time the A-levels will be worthless - they are purely a means to getting a job - if you have achieved the standard, why bother striving for more.
As to the Red Arrows, no harm in having ambition matey, just keep it to yourself, because as you have no doubt already found out we are a harsh bunch and will rib anyone will aspires to be better than average - go for it.
As for Superfluous Bollox - I thought it was a good call, give some of it back!
