Agile - Where would I find the blending valve so that we can check to see if it is stuck?
Gasguru - many thanks for this clarification. Bovis get no awards for using the best products!!
The settings on the boiler, wall mounted in the kitchen have not been changed since it was installed two years ago - when the house was built. Since then we have noticed that the boiler "fires up" even when there is no water being drawn. Also, the temperature in the shower (mixer tap)...