Cloggy, Most of the bits you need will be on ebay. There are rubber tank straps on at present. The headlamp assembly is not that easy to find. If it helps they are the same as the KDX175 which was more popular over here in the UK. The brake levers are on ebay or (as I use) Wemoto. They are identical to the o.e. ones but cheaper. Chain and sprockets are easily available from your local bike shop. Just replaced mine (every 12 months) with a 14T front and a 44T rear with an o-ring chain. If you use anything bigger than the 44 rear you will struggle to get anything more than 40mph. Mine is happy (ish) at 50mph, but I would not want to rev it any more.
I can photocopy a wiring diagram from the B2 book (6 volt) and bring it to Telford, if you are going.
Don't give up on the gutless old crap, once running right they will go places modern bikes can only dream about, do 50mpg, never boil a radiator, always start when drowned or dropped, and always seem to be a talking point where ever they are parked.
The motors can be made to give a bit more power too.