Secondly a pretty average contractor day rate is 500pd, which is over 100k, and there are a lot of contractors. I think it makes eng salaries in the UK seem lower than they are. Many of my friends went contract and would never go back. The senior market is therefore hard to hire for, outside trendy/exciting companies, unless you pay for contractors.
That said, we should all be asking for raises <3! By all I mean everyone apart from the C suites of public companies