Dyson DC07 motor - Where can i get a new thermal cut-out switch?

The motor fitted to the Dyson DC07 and some other models is the YV 2200. Attached to the side of the motor is a white plastic carrier with a capacior [black] and a thermocouple [in a clear plastic sheath]. Does anyone know where I can puchase a new thermocouple from??? - Dyson can only supply new motors and no contacts for the motor suppliers. I have tracked down a YDK [motor manufacturer] web page but can get no response - have tried various electrical/electronic suppliers but cannot find a replacement