likeabird:
You are exactly right. The problem I have found when contemplating life in some small lovely towns in France or elsewhere is 'whay would I do all day?'. And there is a need to factor in the costs of fairly frequent trips back to visit family, etc.
My plan would be to spend no longer than three months at a time wherever I went then return to UK for a visit. That way (with luck) I could avoid having to deal with local bureaucracy - re-registering the car, etc. - and my travel insurance, car insurance, etc., should cover it.
This is a bit like being a kid in a sweetshop - almost too many options!