Ok, I’ll try and keep this as brief as possible but give you a full picture of what I’ve done. I am getting an occasional crackling/arcing type sound from behind the wall in my kitchen. My flat is an attic flat and I am able to get in behind the walls via a crawl space (handy!). In the kitchen there are three plug sockets at counter height, one of which has a spur coming off it where the fridge and hob are plugged in below the counter (hob is gas, plug is for spark). I have checked the wiring into each plug socket as well as the oven switch. All wired in properly, no sign of any burn marks etc. I initially thought the noise might have been a faulty spark unit in my hob, so I turned off the plug to the hob. Didn’t hear any noise for a couple of days, but then heard it again this morning. Climbed in behind the wall and checked all the wires behind the kitchen wall leading to all the plugs etc in case rodents had chewed on the wires. Again, nothing, no bite marks, no burn marks anywhere, all wires in good condition. Nothing is loose or wired in wrong. Oh, I’ve also tried turning off the fridge and oven in case the noise was coming from either, but again, the noise occasionally happened anyway. Just to add a bit more mystery, the noise very rarely happens in the afternoon, seems to only be audible in the morning and then perhaps 1-3 times between 8 and 12ish. I’m starting to think I might be going crazy here….although I’m fairly convinced I’m not hallucinating! Any ideas?