Many of these parts are still available new and not terribly expensive, if you ever need a replacement regulator it's always worth contacting Tim Hodgekiss of
www.vintagemotorspares.com He is a really nice bloke too.
I've just discovered this Forum and am delighted to do so, it's more straightforward than the alternatives and I shan't be sad to see the back of a Yahoo account and the baggage that goes with it.
I've a '49 400 Bristol that I've completely rebuilt, every tiny bit of it and I run
www.jel450.com as well as
www.kda132.com if anyone is interested.
Ashley