It's easy to find reasons for leaving the North - all too often the work is dirty and hard, and unemployment pay never yet paid off a mortgage. But when you're safely installed in a warm Southern factory, doubling your money on a conveyer belt, the chances are you're less likely to find a neighbour who's only a cuppa away, or the warmth of the clubs and pubs. This, then, is the dilemma facing those who move South: is more brass and less muck a fair exchange for what they leave behind? Would you swap your friends for a fiver a week more?