A320, you need to review your ideas on the RAF.
1, you can not view the RAF as a way to build hours to get a airline job.
2, if you want to join the RAF you will need to be 100% to a career (lifetime) in the RAF
3, if you say you want to fly Nimrods or something they will bin you straight away. They only want people who want to fly fast jets.
4, as someone already mentioned, getting into the RAF as a pilot is VERY hard. THey can pick the very best and will not compromise on their expectations.
Take everyones advice, go to uni or go and get a job for a few years.......... build up some life experience, save some money then go flying. If you really want to join the RAF then research it thoroughly and join for the right reasons. They see thousands of hopefulls every year.... they'll spot of fake before you even get of the train at Grantham.