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many thanks Chris. I was just wondering how water got into an air vent and whether that meant something more serious or too technical for me but probably best if i stay out of it if thats the case. Was hoping it would just be a case of replacing the AAV and sorting out the pressure, so will try...

I have a Potterton Combi 80 and it has been leaking water from the automatic air vent. The central heating and radiators have been working ok, when we use the hot water tap, after turning the tap off the boiler makes a horrible noise (kettling???), the noise comes from the back of the boiler...