Thanks for that link, it was a good laugh. The dissonance with reality was strong there. A single look at indeed.co.uk will reveal nary a single 600£ daily rate even for senior developers. Best of luck getting a pay increase; hopefully you don't have to deal with the horror of the H1B process to get paid what should be the global rate for software developers.
I love the veiled language in that article - "a new generation of proto-programmers emerge to correct the market" - you mean you hope a bunch of cheap new blood comes in because you wont pay market rates? Yeah, ok.