Craig if you'd have read my reply in the how tall are you thread, the AAC doesn't have a height restriction.
You have to do all basic in the fixed wing category (used to be Chippies, I don't know what they use now), and then you move across. There was a TV series about this a while back (on BBC I think), have a look in your local second hand bookshops and charity shops, you could find the accompanying book.
Oh and the Police only take ex-military.
And entering the RAF everyone is expected to go fighters, so everyone is a dwarf!
Mark