Thanks. I just needed a wiring diagram for the internal connections from the cord coil, through the switch and the new motor and back to the cord coil. The spade connectors and wiring colours on the old motor didn't bear any resemblance to the new one. I don't think that the old internal wiring colours (red and black) followed the normal protocols of red = live and black = neutral. For example the wires into and out of the switch were black ! Anyway having sent photos and having spoken to Claire and David at Manchester Vacs, I have fitted the new motor and re-connected and reassembled the vac and it's working fine (according to wife !). Thanks to all concerned.