A320_Murray.
Hello,
From what I understand, nothing. Well that’s maybe a bit harsh.
You will leave with a few thousand hours of flying time, that is normally factored on a percentage basis. Have a look at the Easyjet website, they have a general guide. You would have to complete a bridging course to convert from Military fliying to civil, and I believe that the RAF will pay for this, however you have to commit to further service.
As for flying the big stuff, you will initially be selected to flying the mainstay of the RAF, Eurofighter. If you fail selection for that, I believe that you will be rejected. You can however try again, if your within the age limit.
Have you been to your local careers office, if not go along and have a chat, they wont bite…much…!
Good luck,
Fra