I have a 56cm Salsa Casseroll frame and forks which are well used (£120) which you can build into a fixed/single speed do to the sliding rear drop out. I also have some Miche Primato flip flop wheels barely used (£60). I'll put up pics if you're interested?
Forgot about this!
Am now no longer in the market for fixed steel (for the time being, I'm now near herne hill so a track bike is in my future). Thanks to all that replied, I am now sorted.