I'm afraid you're right Chipmunk. This unit is just out of warranty apparently.
Paul I take it this is a double-Insulated Appliance, but in the bottom pic there is a screw holding a wire and terminal to the outer part of the motor "body".
Yes, it's double-insulated with a 2-wire cord. The connection is part of the interference suppression. It just goes to a twin capacitor (you can see it lower left in the first/second pics), one cap to each side of the supply.
I'm guessing that it's one of the very cheap brands,
It's a Draper -- Sold widely here in the lower end of the power tool market in DIY chains, supermarkets, car accessory shops, etc.
http://www.tooled-up.com/Product.asp?PID=91557
