Gents,
Its huge thank you time
I had a closer look at the yoke as John suggested, and there it was,
the thermistor wasnt buried in the coil assembly but clipped next to it.
There wasnt any need to measure it, it had fallen apart! We have frame scan
.
I wasnt too far away in thinking scan coils....but the answer ultimately was found on here. Once again thanks ever so much for all the responses and sound (and correct) advice!
Regards, Stu