I'm answering my own question as no others have been forthcoming. When I changed the brushes I noticed the plastic insulation around the spade connector was burnt through and and was shorting against the motors chassis. I soldered on a new connector, fitted a plastic sleeve to insulate and Bob is my fathers brother! I now have to keep an eye on the insulator as the original was hard moulded on plastic but mine is a soft plastic sleeve. Fingers crossed! Another tip buy your brushes from your local shop (Euronics)they were half the price of anything I could find online. Cheers, NeilC
Neil Cooper, October 2007