Its very much feasible. The MOD CS has a lot of people who are ex-military, and a H&S Officer/QCIT role would sit at the C2 grade which pays around 38k a year. If the job advert lists part of the essential criteria as "recent experience of aircraft engineering practices", you'd instantly be narrowing it down to ex-mil technicians who probably have a £12k+ a year pension that they will continue to receive, taking their salary to £50k+. Plus, there's no OOE, Guard Commander, Parades, short-notice postings etc.