The software industry here in London is really badly paid, for salaried jobs outside finance at least. I know plenty of developers who started at £20-25k as graduates from decent universities and whose salary has slowly risen to 40k over quite a few years. PhD graduates making £35-45k too.
Well, my wife recently started in France, with M.Eng. in CS, for what translates to around £25k/year. And that is considered well paid.
EDIT: @nawitus:
Sorry but your data is totally useless for this purpose. 1) it's the whole economy, not just programmers and 2) it includes part time workers! To imply that full-time programmers in London are working on average less than a 40 hour week is so far from reality.