That is around £114k, which is a high salary for London, but nothing in comparison to what you can make contracting (and at the same 'salary', as a contractor y

That is around £114k, which is a high salary for London, but nothing in comparison to what you can make contracting (and at the same 'salary', as a contractor you'll pay less tax in the UK). The base rates for web technologies are around £500/day, and if you specialise and have a track record for delivering you can easily push that up.