TOFO,
You say... "There will be a few for whom it would make sense - older, well set, up semi-retired guys who live locally for example". Live locally to where I would ask?
Since you seem to be responding to "bluetails" post referring to ex-Kipper Fleet personnel, its not much point trying to recruit semi-retired guys living in the Moray area if your aircraft (P-8?) is going to be based at Waddington!! Maybe some ex-51 with maritime experience living near Waddington? But that's going to be a very small pool.