Every downstairs light in my house has stopped working simultaneously. Naturally, as all upstairs lights and all power sockets still work fine, I assumed this would mean that one of the two 5-amp fuses in the main box that had gone. However, all fuses are intact, and swapping the two 5-amps over still leaves upstairs working and downstairs not working.
No work was being done on anything electrical when this started. No bulbs have gone. Any ideas please? If it's a break in a main wire somewhere near the fuse box, how can I trace it?