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I can hear a ticking noise coming from a section of central heating pipe in the wall when the heating is on. The ticking starts at a fast pace then slows down, then starts to speed up again, all very uniformly. Is this just expansion of the pipes or is there something more ominous going on?

I need to premanently remove a small radiator in my kitchen, which is on an open vented system. I undertsand that with the pump switched of then the pressure is standard atmospheric pressure, which means that I could technically hold back the pressure with my hand. If so, (and I don't mind...