I have several friends who have joined the RAF as technicians and subsequently gone on to airline careers; however, it is an extremely long-winded process. Furthermore, you are likely to be extremely dis-satisfied with the life as a techie if you actually want to be a pilot. Is it worth wasting several years of your life doing something in which you have little or no real interest? Finally, having a few years experience as an RAF technician will offer no real advantages when it comes to getting a first flying job.