A belated report from Graham Clarke:
Last weekend at Barrow Hill: the depot floors were steam cleaned, a lot of priming was carried out under 55015 and I worked on building a test set for coolant temperature probes. We have had trouble with these not working when they should and when they should not. The results being respectively, hot engines and unwanted shutdowns. Remarkably, the same switch exactly is still available from Teddington Controls. That’s at least 33 years since our spares were bought! That to Tom, Geoff, Robin and Ray.