If you are still in the military you can gain accreditation through the City and Guilds. This will vary with your rank. These are NVQs, or equivalent. For example, a flt lt can gain the 'equivalent' of an Honours Degree and a sqn ldr can gain the equivalent of a Master's. I believe you can still apply post service - 5 years? These are recognised qualifications.
You apply through your Education Section, or whatever it's called these days.