[Neil Jones]

One thing I never understood about Supergran was that it was set in Scotland but made by Tyne-Tees.

Not unusual.

Fawlty Towers was set in Torquay, but the bulk of the externals were done in North London. Indeed the "Damn good thrashing" was done in the middle of a residential estate in Harrow I think it was.

Crossroads was set in the fictional King's Oak which is supposedly somewhere south of Birmingham, but after I think 1984 was filmed in Nottingham. The later revival locations were done in Bingham which is somewhere off to the east of Nottingham.

Probably no end of other examples.