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I have a Vaillant ecotec plus, some years old, recently serviced, seemingly running well. Very occasionally there is a problem - you can here a clanking from the radiators, about 2 or 3 bangs a second. The noise seems to come more from the radiators than inside the boiler. I took the front...

My sister had 2 bathroom lights from 12 years ago which she is removing after a redecoration. 5A lighting wire emerges from the wall, which is hardboard. All connections were made inside the old lights. It looks like all lights nowadays are rather tiny and double insulated. There is...