Does anyone know where i can find the part number for the small regulator for the heated seat unit that is attached to the undeside of the seat?

Hope this helps in some way?

Thats exactly what i wanted dev ,Thanks mate!

Don't suppose you have a wiring diagram for it and what voltages it sends out????

Sorry, you're asking too much of my parts catalogue for that info.

Might sound a silly question, but I would have thought it was 12v like the rest of the car, unless its some form of inverter?

It is controlled by a Rheostat in the dash which will output a voltage proportional to the 12v input and the position you have it in. I would imagine the control unit just distributes it and monitors the temp.