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Why would wall sockets jam? ie. the holes of both twin sockets seem blocked, I cannot plug anything in and the switches are jammed at ON position. I noticed the sockets had been 'awkward' for a while, but now the sockets are simply inaccessible. I have no clue what is causing this. Is it dangerous?

A few weeks ago water pressure inexplicably shot up from 2 to 4 when boiler was on. Usually the pressure does not go above 2 when on. Had to get engineer out. He drained it back down to 1 (usual cold setting) and could find no fault, he suggested it had been over-pressurised, which I know for...