Electrical fault - NOT amateur radio

Last night all the electrics went off. It was only in our house, so my heart sank. Using the switch box (isolators) I managed to isolate the fault to one set of sockets and turned this circuit off, so all other circuits still worked.

The electrician who installed the whole electrics came out early and found the fault in one socket, which he fixed. After 5 years it had got damp (no obvious leaks). This should be covered by the 10 year warranty we took out, otherwise we have to pay up for the callout and repair.