Right done some investigating into this. Spoke to Dave briefly (12m 53s anybody better that?) and now getting the one he has sourced for £15 that turns on at lower temperatures. It looks a bit different as it has more of a probe sticking into the pipe and apparently needs a cable tie to retain it. But it has the same push fit anyway. Anyone who needs/wants an original one, it is off a Rover Metro and lots of other cars of that era, part Lucas SNB748, this cuts in at 97 and off at 88, extortinate price of £4.79, there was another one that cut in at 95 instead, but I didn't note its number. and yes they come with new grommets, my old one is all cracked and not reusable. Rich