Smith most people who leave after completing a contract get a lump sum. It's up to them how they spend it. As far as I remember, the acceptable resettlement courses (paid for directly by the Service) did not include flying training, but it may be different now.
Martin, my own time in the RAF is now a few years in the past (I left in 1998). To help you, I'm going to move this thread to Mil Aircrew where those currently in the Service can give you the up-to-date info. You might also have a good look around in that forum (use the search facility) to get a feel for the RAF, the Regiment and any other topics that might interest you. I think we've probably exhausted what Wannabes can offer you for now.
Scroggs