I have just installed an outside tap, and I am amazed how much this has affected the cold water pressure around the house, even with the tap turned off. It must have reduced the pressure by about 50% everywhere (kitchen, downstairs WC, bathroom).
Is there anything I can do to restore it to something like it was before.
I am presuming you turned of the mains tap to install your outside tap?
I would guess that when you turned the mains back on you perhaps did not fully open the mains tap or the it has developed a fault and may need replacing,
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