Cos is a B*****D KESTON OF COURSE!!!!
Actually the stat in question is part of the Megaflo tank .
He did some continuity checks on the stat and wiring and everything worked as it should so who knows maybe an intermittently faulty stat or is it a case that they either work or not? It's still working tonight so 3 days which is a new record. However, I noticed that the plastic control facia is cracked in three places which has happened during one of the last three visits. It's all deeply unimpressive so I've written a stroppy letter to them. The French strike and blockade ports we British write letters.