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I've got a set just like this from AliExpress. They don't get proper hot just kinda warm. I can't say I fully trust AliExpress electrics so I don't use it when I'm out the house but so far they've worked. Might be worth getting a small dehumidifier too. Last year I got a heated blanket off Amazon, the plug developed a problem so I replaced it and realised it doesn't have a ground cable. Be very cautious of anything with slightly dubious origins.
XTDMJ Electric Shoe Dryer Boot Dryer, Ski Boots Dryer, Shoe & Boot Warmer to Dry Sweaty Shoes & Eliminate Bad Odor (Standard UK Plug) https://amzn.eu/d/dqmKAim
Electric shoe-driers (this sort of thing) - do they work/are they going to burn my house down/if I get the ones from AliX for £10, are THEY going to burn my house down?
3 x dog walks a day in winter means my walking boots never really dry out, and I just hate wearing wellies unless we're going to proper slop-town.