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Thanks for the advice. Well as a cheap fix for now the expansion vessel was repressurised and a new PRV & vent valve fitted. Now the pressure only goes up to 1.4 bar when the heating is on. Guess the expansion vessel wasn't doing its job before. Question is should new corrosion inhibitor be...

I have a Worcester 9.24 combi boiler that was fitted in 1990. It has served us well requiring only a diveter valve and an overheat thermostat replacing in its time. I now have a problem that sometimes the boiler trips out on overheat when taking a shower but only if the rest of the heating...