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@Arducius
My water pipes have started whistling. I've traced the noise to a pressure reducing valve (oddly not the first component in the plumbing run after stop valve and drain cock so there are some higher pressure taps). The noise only started after I turned the water off and back on again. Googling suggests an obstruction of some sort. Could it just be a bit of scale flaked off and got stuck? Any go-to fixes before I just fit a new valve?