So does anyone have a good supplier of replacement belts?  I'd prefer a UK supplier simply for speed of delivery and cost of postage but I'll take whatever is available.

I've done some googling and only found one exact match on ebay USA (which is actually from a company in China) though I've found a few others that have an extra 'tooth' but at the right pitch, etc. that would probably work as the belt tensioner would take the slack but I'd rather get an exact fit.