FOR PITY'S SAKE!
Don't join the RAF just because you fancy flying! It's actually a jolly difficult way to get into aviation, and requires a lot of committment. And you will end up walking sideways.
As I clicked to reply to this thread, the Multiflight 'Zero to ATPL for £29950' ad popped up. Not sure what they're running, but for a ballpark fighure if you're prepared to go abroad and be a little creative should be AT LEAST £30k. It can cost significantly more if you chose to study and fly in this country with the likes of Oxford.
147- you've taken the right first step- PPRuNe has the best advice- if you know who to listen to.