Found bike salvage site with good selction of engines.

http://www.m1salvageandbreakers.co.uk/honda%20frame.htm

And a good selection of frames too I see.

Not exactly asda price either. I phoned them about some switches and they were nearly as dear as the local bike shops new price.

they also wanted £40 for a set of rubber carb-to-inlet clamps for a fireblade!