Up voting this isn't enough. London can pay well, better than everywhere in Europe even, at the right company and with good negociating power. If a UK firm contact you, you're set and have us-level salaries (upward 200k 8 years ago in medtech). If you're just going back to europe for a routine job however, you should first check Switzerland (then Netherlands. They also have the most interesting jobs if you're a low-level guy)
>upward 200k 8 years ago in medtech
Which UK companies paid 200k 8 years ago?
I'm not the one who got hired (sadly), but the person who got the offer was a nodejs developer who wrote some random promise libraries (he was really good at optimizing calls, both real-time and async, and knew js better than anybody I've met since), and I think I remember he talked about a private clinic or something (private monitoring?). He ended up being tech lead at an online bank for less money.