Earlier quoted context omitted.
For London I strongly disagree. When start-ups, profitable ones, are offering £35k + bonus + stock options (worth £0), for senior developers, in Central London, there's not a talent shortage. Similarly skilled developers are getting £35k+ & bonus outside of London, where the cost of commuting/living is significantly cheaper, in established companies with full benefits packages, that don't expect them to work 50 hour…
That sounds wrong to me. I've seen lead/senior JS devs on £85k (~$130k) in London and mid-level generic PHP/Django/Rails developers seem to start in the mid-40s, with senior devs getting 60-70k. That's before you start looking at contractor rates...
http://www.technojobs.co.uk/search.phtml/php/searchfield/loc...
There are a few above 40, but they don't sound mid-level/generic.