That bit is Nigel, but it was still not charging.
So I decided to have a look at the stator. Took off the engine cover etc. Undoing the screws holding the screen on, strange noises emanated from behind the flywheel. No need to guess what was making them.
Removing the fly wheel revealed a sorry stator and magnets in a right state. If you'll pardon the pun.
Bit of a mess and no wonder it wasn't charging. All is not lost though. A Raider 10 engine I rebuilt a while ago, has donated it's flywheel and stator.
Tomorrow I'll reassemble things and hopefully all will be well.