I get knocking in my pipes when the hot water is turned on (with or without the heating on). If I turn on the water heating only, the boiler (including the pilot light) tends to go out after a lot of knocking; if I turn the heating on with the hot water the knocking continues but the boiler stays on. We live in an area with a high degree of hard water, could it be that I need to flush the heating system out? I've checked the flow on the cold water header tank, it good; the heating header tank is also up to level. My boiler is an old Glo-Worm Fuel Saver MK11 and it has recently been serviced by British Gas.
My regular plumber is not available for a couple of weeks hence the DIY!
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