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I have found the issue, which is not coming from the boiler itself. Some leaking water is dripping from one of the flats above mine from their flue onto mine, creating the loud echoing sound.

Hello, I have just moved in to a new flat this week and have a problem with noise coming from somewhere around the top of the boiler. It's a loud clicking/knocking sound that lasts about a minute, stops for 20-30 seconds and starts again. It seems to happen at night, starting in the evening...