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Have had this before and the flue sealing ring in the flue turret was not installled correctly. Have you checked basics this boiler needs a min gas inlet pressure of 18 mbars. Also have you checked the overheat stat for continuity this can take out the gas valve. If this is all ok and visual...

I would agree, if you go with Baxi they will only look at the appliance. BG will look at they whole system so you could get the leak and boiler problem sorted, rather than pay baxi to look at boiler then someone else to look at pressure drop.

could be a bypass issue if you have two 2 port valves then some form of bypass will be required does your towel rail still get hot with the hot water? If it is overheating once the valves have been turned off ie no demand for heating or hot water then the water is being pumped with no where to...