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Sorry, it was eBay nearly 2 years ago. I'm on Xmas hols and can't look at the make, and that one is no longer available. With hindsight it was far too cheap, about £5.

Be careful if buying rechargeable. I got a cheap one, bad idea. It runs for only 30 minutes and takes several hours to recharge.

Fine. But don't tell me the house needs completely rewiring when you haven't done the tests to establish that.

Consumer electrical products are designed to be assembled, but by no means always to be disassembled. (That was the old days.) Look for screws hidden beneath trim, feet, labels etc. Plastic bits might need prising off. Sometimes you need so much force it feels as if you'll break it, and...

Good idea! But on my phone, the end of a fuse has only just a big enough area. A smaller area contact won't work. So try with a good one before you rely on this method.

Regardless of the reason for installing, a ferrite ring has to be chosen for current so it doesn't saturate. Overloaded bead will have harmonics in the magnetism and buzz even if the current is pure 50 Hz.

I'm not a qualified electrician, but I was trained by the BBC as a radio broadcasting engineer in the 1960s. I did a lot of electronic repair and some circuit design, so I'm fairly well up on electrical basics, measurement etc. I don't know much about details of the current fixed installation...