JC,
I wouldn't imagine it being a problem. Usually with the RAF you have to enter IOT by the time you are 23.5, I which case I suggest you contact them and ask if that applies to you. It may not as you already have more hours than most Lt Flts.
With all the multi time you've got I'd say the RAF would suit you best, unless you fancy your hand at a Harrier or the chopper.
Only trouble is, a VC10 doesn't shoot! I'd imagine the RAF would try and stream you onto Multis rather than retrain you onto FJ or Rotary.
Good luck with it. I doub't you'll have too much trouble