AAC ain't a bad choice, I know a few guys who fly apaches and love it and also someone who is going through the selection process just now. If you want I can pass on e-mail addresses and you can have a wee chat- they love talking about it! The guy in charge of Officer recruiting is also a very sound man and will be happy to discuss any queries with you, I have e-mail for him too (oh, apparently he may have a bit of a soft spot for the luverly ladies!).
There are 2 routes to flying in the AAC- commissioned and NCO and 2 choices of craft to fly- Lynx and Apache. I think everyone starts on Lynx. For NCO you just pop along to AFCO and apply, sit the BARB test and go from there: 12wks phase 1 at Pirbright then phase 2 at Middle Wallop- the School of Army Aviation. You can't start flying training until you reach Lance Corporal (about 4 years) and pass aptitude testing and flying grading. There may, however, be exceptions if you have previous flying experience.
Officer route: As you know you have to apply for a commission and place at Sandhurst. The recruiting Officer will put you in touch with AAC. The AAC like you to have sat the aptitude tests at Cramwell and to go on a familiarisation visit where they can offer you 'sponosorship'. Once you have passed AOSB you can do your flying grading before going to Sandhurst. Although you can not be guaranteed AAC if you have done all of this before going then you have a pretty high chance of getting an offer.
I hope this helps and just say if you need any more gen. The apache is a beast of a craft and it doesn't just act as chaperone to the Chinook!!