Congrats on your choice.
A few words. Patience. Discipline. Dedication.
You're gonna need all three to achieve that dream, which was my dream years ago as well. I didn't apply myself properly, didn't have good information, and therefore did not achieve said dream. I can't speak for the RAF, because I'm in the USAF and things are different. I will say this. My 15.5 years of service have been what has defined me as a person and I'd change nothing. I am going to Officer school next month and will be leaving a flying job for a space job. I'm an AWACS Weapons Director, not a pilot. I tell pilots where to go and who to shoot at. I've spent over 3100 hours in a big round tube without windows flying all over the world. The friends I've met in the military and because of the military are far better than any of those that I had before I joined. The humor and comradarie is special, nothing else compares. There are no stronger memories.
Set your goals high and strive to achieve them. Don't ever let anyone tell you "you can't". That's B.S. Anything is possible. I've been turned down for Officer School twice due to technicalities, but got in on the third try after rewording some stuff and talking to the right people. That is key. Having the right information. Recruiters are known to lie. Talk to someone in the know, like someone who's a pilot now.
Just have a back up to the back up plan in case you can't find a pilot's slot.
Good luck to you sir and again, congrats for making this decision.