Hard to find parts

Dave Marsh: www.universalcyclecentre.co.uk

You tried him? I think the Chainring you want is exactly that: £40, if he can find it. Perhaps ask nicely for a little discount when he's had a chance to dig it all out for you?

their rear track nuts are cheap, or cheaper than i have seen around

just realised it says 8 pounds 'each'