Not heard of anyone on the Retired List being called, pilot or otherwise. Can't speak for the reservists, but no FTRS being called. Can't speak for the RAF, but Royal Navy reserve pilots wouldn't have anything to worry about.....exactly which airframes would they fly?? They are few and far between. Don't think GR7 RAF boys need worry with the RN F/A2 daddies looking after them......as usual they'd probably whine about the state of their accommodation onboard our ships and try to scupper all our beer!
As for what type of flying they would do? The best, raining death from above in order to ensure survival of the fittest.
Death or glory, sorry if I have offended the tree hugging happy brigade.