Earlier quoted context omitted.
We have a similar problem in Scotland, I know a lot of people would love to have continued living in Scotland but can make >2 times the salary as a developer by making the move down to London. The cost of living in London is higher, but the increase in pay more than makes up for this. Granted, this is a move within the UK so it's not really a drain on the UK's economy but it leads to a more London-centric economy and…
What's really crazy is that salaries in London aren't that high (unless you are in the financial sector). I am constantly astonished by the low salaries (for qualified programmers) offered in most parts of Britain. I suspect that you could actually get away with building a consulting firm in the country side and getting companies to offshore work from the US.
Thinking about it, I know a dozen or so people in the "poor deprived" north east of England earning over £40K who are under 30 years old so we're not all badly paid.