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Thanks for all your advice. I'll investigate the descaling option.

I'll try collecting some gas to see if it's a corrosion issue. The plumber I had used some enormous machine to do the flushing, and according to his bill he did a "Power flush, refilled the system, added inhibitor and tested".

Hi. Not an unusual post I see, but I've done most things I can think of. I spent about £700 this year having a plumber replace a pipe from my boiler to the tank and flush the system completely to eliminate boiler noise I was getting. This worked for about two days after I switched on the heating...