Thanks to Ted Taylor I now have a lever for the heater valve which can be seen in the next photo and then fitted in the one after.
What doesn't happen though is the heater getting hot - hence "cold but dry feet".
Under the engine bay I disconnected the hoses to the inlet manifold and ran water through them which cleared any residue out as I thought a blockage there might be a problem.
I am currently wondering if I have the heater hoses connected the right way round but can't really see how they could be wrong. I can't find a decent picture of another 2000 in this are though so it's difficult to know.
I will sort it though. In the meantime here's pictures of my heater hoses so if anyone is reading this and thinks they are not connected right please get in touch.