am a bit mystified by a background water pressure sound in my mains pipes. A callout service suggested I had a leak under my kitchen floor so I had the kitchen ripped out, tiles up, hole dug in the concrete, but nothing found. As there are no leaks anywhere else (the two cold tanks in the attic are fine) I can only think of the front of the house where I had a hole dug last year to replace a faulty stopcock with a plastic to lead joint so I guess there might be a change in pressure there, but why now?
Most likely that there is a leak in the mains pipe near to your house. If you are on a meter make sure it is not spinning round when no water is being used in your house.
Get in touch with the water board and see if they will investigate outside.
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