Patience Jamie, is a virtue - I'm sure if you keep bumping this thread, someone will have the answers - just dont be impatient and try doing it yourself, or your £30 motor will be as toast as your old one.
I dont have the answer, as I dont have a turbopower any more, but isnt this your autosense model that has variable power to the motor - I'm not sure if the motor itself steps down the power or the circuitry in the cleaner does it. I'm only used to motors with 2 wires like in the Dysons. Maybe vintagehoover might be able to assist you? he usually comes on most days so just be patient......