Hmm, there's quite a few places in the UK I think you'd be surprised. The salary's are not as high - but they're still really high and outside of london you save mega moneys.

Moved to Glasgow for a higher salary than I had in London, and where rent is 1/3 of the price.

There's Edinburgh, Manchester(home of the bbc) (ranked as two of the best cities for tech in the UK, manchester for media city), Bristol, Bath, Newcastle, Cambridge. All good salaries and likely to save more money than in London.