Dodge, re: nursing within RAF - can't speak from direct experience, however my father was involved in nursing in the RAF for 26 yrs.
There is a maximum age for entry (30?) and you have to sign up for a minimum term (9yrs?, or maybe even longer). Most of the training these days is done within the NHS anyway (in Birmingham I think). And then there are all the wonderful foreign postings - not! My fathers experience included Aden (war), Cyprus, Belize (war), Ascension (Falklands) and Germany (which was good but is now closed). Mustn't forget the "on-call" either. I am now nearly 40 and still remember vividly each time my father was dragged out of bed in the middle of the night to disappear of to some troublespot for days or even months. It should be said though that maybe he wouldn't have had this lifestyle if he hadn't chosen MedEvac as a trade. When he came out he couldn't deal with the NHS. He really hated (with absolute vitriol) all the management that went with it, and believed that the good work done by medical staff was seriously compromised by truly sh1te management which wouldn't survive outside the NHS.
So, all-in-all, would it really offer anything different? Probably not! Unfortunately can't ask my father as he died some years ago, but may still have other contacts if you are interested in this option.