(it's a 2.2 TDCI estate, mk3, 55 plate)
Cruise control has stopped working... Already ruled out clutch and brake switches (clutch switch registers correctly on Formiddable, brake switch runs the lights). The cruise control logo appears on the dash on startup then goes out, like normal, though I don't know if that's relevant.
So that leaves... Steering wheel switches, actual cruise control brain whotsit, and possibly fuse? If it's the control module then I'll not bother I think...
Anything else I should consider? Or useful diagnostics? If it's switches, I can't think of any way to distinguish whether it's the cruise control master on button on the left, or the button on the right that controls it once on, is there any indication available when the system is switched on but not currently cruise controlling?
PS, I noticed it had failed at the exact moment I passed through 111111 miles on the odometer, and so became convinced that the car's whole electrics had shit the bed and blanked out the console. This lasted for ever so slightly less than one minute