IO you've just described my former business plan! Being in the middle of the commuter belt for the city of London there are an awful lot of the type of punter you descibe living in the local area, I've got a friend who works for a large marketing firm and according to his data, the average salary within 10 miles of the field is circa 60k!
Anyone fancy setting up a PPrune flight school run in the way we all would like?