you clearly have skills and there is a terrible shortage of ANY skills in the UK these days - you should be able to manage a transition to consulting - and then you can tailor the work load to your medical condition
If you don't get it as part of the package its worth spending a few quid on professional advice - preferably from someone who works in your line. Make a list of outside outfits you 've worked with while in the RAF - and check them out. Start reading the trade journals for your speciality etc and get up to speed with the outside world - just knowing the current issues and jargon is half the battle.
As said Mrs Happy should do the same - she has a wealth of experinece in strange places - she doesn't want to be a "When I......" but she can retrain or start her own business
God knows - it seems that the ability to read, write, speak, and turn up on time is beyond 50% of the UK workforce so there are surely opportunities for you and Mrs H
Good luck
