Are there any crossovers these days? If not:
1. Check the revised military accreditation criteria in CAP 804 when it is released in a few weeks time.
2. Establish whether it is worth going for a CPL(H) first, or whether you might as well go for a CPL(A) / IR(A). Whichever way is unlikely to be cheap, quick or painless, I regret to say.
3. With a CPL(A) / IR(A), you would at least stand a chance of being employable. A known-to-be QSP-friendly airline is Jet2, see
http://www.jet2.com/Careers/In_The_A...irst_Officers/ . They are based at Leeds Bradford International Airport, with further bases at 7 other Northern UK airports - Belfast International, Blackpool, East Midlands, Edinburgh, Glasgow, Manchester and Newcastle. They operate flights to over 50 destinations; their Chief Pilot is ex-RAF and tells me that all the QSPs he's recruited have done well.
4. Airlines look for 'experience commensurate with age', but the very best of luck to you!