I let my son have a little tootle up his road last night, so videoed it. The bike seems to be running okish now, but I should have rebuilt the crank as the centre bearing is quite noisy now. Obviously 40 years of non use has taken it's toll. She's coming off the road over the winter, so I'll probably strip the engine & send the crank away to Grampian in Liverpool for a rebuild ready for the summer next year.