http://www.rafcareers.com/jobs/pilot.cfm
http://shared.armyjobs.mod.uk/JobDes...ficerPilot.htm
http://www.royal-navy.mod.uk/server/show/nav.4994
At 14, you have plenty of time think about what you plan to do with your future and I would strongly advise you to think long and hard about ALL your options before parting with any money!
If you do decide to follow the military route, now is probably a good time to start looking at the sponsorship options available to you
Good luck in whatever you decide...