Cheers for the offer Steve but i passed a breakers yard today which was open! Managed to pick one up for just £5. All fitted now and after following a guide posted by sarge on the basic settings i have now cleared an abs light, traction control light and the engine management light. Its been a good day.
I also was able for the first time to drive the car (albeit it up and down a very short private road). All good so far, Im hoping all 90s are like this but this being the only Tdi90 I've driven it feels completely different to the 75bhp version. It accelerates so much smoother and doesn't seem to have the same 'punch' as the 75 but it is fast, Im guessing this is primarily down to the Turbo differences.
I will post some pictures tomorrow to show some progress.