right, managed to get a source of these little belts as sold by pit stop, g-werks and g-laderseite.
These are the 12mm wide ones (originals are 8mm) that are exposed once you take the charger off. These if contaminated with oil - or if perished with age - go BANG and so does your lader with it. Steve Pitt (beavis) used to recommend these get changed every 12 months to be safe, perhaps this is overkill but having a recent one definately is good idea. They are so easy to change once the charger is off.
The ones we have sourced are optibelt - who if you don't know are german, make timing belts etc. so are good quality.
These are £6 each with £3 p+p if you want them posted.
I'll also have them at the rolling road day for people to buy.
Pete