I don't know about that... Salaries in the UK are crap, much lower than in the EU; and I have the impression that London is only up in the stats because of the quant jobs, which while technically 'software development' jobs, are out of reach for most people that would consider themselves 'software developers'. Now I don't keep quite as close an eye on the UK job market as I used to, but even the job opening and contracts I see on mailing lists I'm on, don't make me want to jump ship...