Had the same problem with my house (that has a shared main) when they raised the water pressure in our area.
Its normally down to a loose pipe somewhere & would be best found & secured with a clip or if under the floor some pipe insulation put around the knocking part.
In my house i got away with just turning down the main stop cock. But this not recommended if you have a combination boiler that's not on its own water supply from the main stop cock.
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