I have always wanted to be a pilot for both the RAF and Commercial airlines. Would it be possible for me to serve, for say 6 months in the RAF, and then when not deployed work as a commercial pilot. Just asking this as I saw a video a few months ago of a US Air Force member who works for United when he is not working for the USAF. Thanks - Jay.
Basic officer training in the RAF takes 30 weeks, so you're already over your six months, even before you start pilot training.
When you sign up you enlist for a minimum period which varies according to your speciality. Six to twelve years is typical. Source
Assuming you get through pilot training and make it to a squadron, you're not going to just sit around and wait for a war. There's ongoing training, exercises, active deployments and other duties that will take up your time. Whilst there will be periods where your working life will be 9-to-5, there will also be periods where you'll be working nights, weekends, public holidays, and away from home.
I don't know what the RAF policy on second jobs is, but for practical reasons I can't see that you would be able to drive buses for easyJet or the like.