Neutral and Earth wrong way round
The house has been rewired, I'm just not sure when.
The offending socket has been used fine, including a vaccum cleaner
which i think consume a fair number of watts.
I've checked a few more sockets and found loose wires where spurs
(sometimes more than one!) have been added. Just looks like a bad DIY
by the previous owners I can rectify myself.
Thanks everyone, your comments are very helpful.
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