Good advice above. Done 2 colours of uniform and the bit about the Army is true.
If you want to fly - then make that the only thing you want to do otherwise you simply will not get through.
If you want to shoot guns,lob grenades, jump put of the side of a C130 or A400, do lots of Adv Trg, lead a group of 30 or so men (all men so far in the Inf) then do AOSB and go to RMA Sandhurst...and leave after 4 years of so when your self-confidence will be much improved and you will find a job - not necessarily the long-term career you want - easily and you can fire and manouevre forwards from there.
The RAF is a different beast - man the equiment vs equip the man/lady.
There is not a whole lot of difference between Int Corps and RAF Int.
Over to you.
(Agree about Chipmunks above - they are long gone and might just indicate that you are not serious about flying. There will be youngsters that will tell you the bore of the pistons of the Tutors because that is all they want to do. Motivation?)