rgirling
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Immediately I close it, most of the time, especially at night, which is why I leave one cracked open. The noise also stops if I depress any of the toilet ball cocks, but it would as they're off the same supply.
Once water is drawn from the tank (and, therefore, lowering the level, I suppose), the noise goes away and often for several hours, but rarely more than a day, once all taps are closed. There's a gate valve on the downpipes for the cold supply from the tank, but shutting that makes no difference either (although I accept they're notorious for letting by).
Ray
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