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Thanks for that Colin.Hello HippyHappyDad. This will be a tough one to find. The cables themselves will not be the problem - they work ok in damp environments. As above, remove every fitting you can find, dry the cable ends and test individually. My suspicion would be buried choc bar connectors plastered directly into a damp wall and hidden from view; kitchen fitters occasionally perform this trick when a kitchen gets re-modelled. If the wall has been re-plastered, only the householder's knowledge might help with identifying the location of any redundant accessory that was removed. Sometimes moving the sockets up to 4ft above floor level gets them out of the damp zone. Sometimes, a surface box is better than a flush one for a damp wall. Possibly a nail in the wall has gone into a cable (the RCD should trip for this). All a bit of a PITA. Regards,
Colin Jenkins.
A very decent reply for your 2nd ever post .
I think removing all fittings and testing is unfortunately the way forward.