(Parts of this borrowed from a very close friend of mine who remains pseudonymous)
In the 1969 series The Secret Service, Father Stanley Unwin is a middle-aged Model-T driving priest who moonlights as a spy, or more specifically a counter-spy stopping various foreigners and criminals from doing bad stuff to British commercial interests. This Gerry Anderson series mixed puppets and live action.
So the usual things to happen are; Father Stanley Unwin's first response is to shrink Matthew, he uses Stanley Unwinese (a made up language demonstrated in this scene from a Carry On film) to get out of difficult situations, his Model T Ford, Gabriel drives across Westminster bridge and B.I.S.H.O.P (British Intelligence Service Headquarters Operation Priest) gives them an unlikely task.
As an example, I've put together some sort of review for my notes for the episode School For Spies. In this episode, foreigners have created a school which trains spies to blend into English society by pretending to be priests, but rather than answering to BISHOP, they're lead by the evil Archdeacon. One of them gives themselves away by preferring pop music to hymns. As is often the case, Father Unwin smuggles Matthew into the bad guys headquarters in his briefcase, but they fail to check his luggage. Trailer
For some reason this wasn't picked up for a second series, which left Gerry Anderson free for his next project UFO.