Just about to get stuck in again and saw yours and James' posts.
Yes the voltages readings were taken under fault conditions with my DVM Fluke (I only have a few seconds window when the set works)
I am pretty certain it is a 10k Alan but will get a camera in there to check. Both ends are soldered and the set performed flawlessly for nearly a month.
I will run James' tests and report back, huge thanks James and Alan (and everyone else on the safety advice),