Barry,
Like the other Geoff I can recommend Moto Ward (
www.motoward.co.uk ), who I have used for a number of years for Parts, but they have moved away from the Kingston area recently into Sussex.
In my book, Think Auto are the experts in this particular field, and I have used them on a couple of projects (
www.thinkauto.co.uk ). Take a look at their site, but I would also recommend you go there (Isleworth - not far from Slough) as they have taken a look at what I wanted to replace, made up bits, etc.., and also been cheaper than anywhere else I can find.
Good luck, Geoff