Ed Banyard is at Tamar Marine and can be contacted on 01208 873777.
We have had a set a while ago, and i know of several other commercial people that have used his tubes. Im sure Paul Tilley can quote you aswell!
As far as the fairlead goes, Paul is correct, Halmatic (VT) will sell you them for a small fortune! Best chance is to find someone with a scrap set of tubes and remove the fitting. Possibly worth trying Poly Marine, they sell material & parts for tubes eg handles, fender strip etc , they may have a similar fairlead, not the same alloy one though. You will find them on the web quite easily.