The worst part of the British system though (although I don’t think this has anything to do with voltage, IDK) is there is nowhere to plug-in your razor, hair clippers, hair dryer, toothbrush, curling iron, etc. etc.
Regulations change over time, this home's bathrooms are all interior, with fans to evacuate moisture, and the toilets accordingly have internal overflow†, both these features were not legal when my parents home was built.
† Historically for a residential toilet in the UK if the water rises above the intended maximum level in the tank, it just runs into a pipe to the outside of the building, in principle you can now see what's wrong and it's not dangerous... but, if you don't fix it promptly this results in a stain on the building exterior, as well as potentially wider water damage, plus it can freeze in mid-winter which isn't good. But wait, a toilet has a very obvious place to dump unwanted water, it's connected to the sewer and if that is broken you've got much more serious problems. So a modern toilet tank just re-uses the flush mechanism to dump excess water the same place as everything else. This elegant solution, already needed in some commercial applications, was I believe made legal in newer residential building regulations maybe in the 1980s.
Part of the reason I emigrated.
https://www.canadianhomeinspection.com/home-reference-librar...
There's a famous, common 20VA fixture by Legrand with a distinctive symbol. I asked an electrician about this last year. Most electricians will still fit them.
It won't supply a hairdryer or a pair of curling tongs, probably. Not that you really want such things in a bathroom or without an earth pin.
I've rarely had it happen in the bathroom, even with outlets right next to a sink. But I had an outlet at ground level outdoors that would trip during heavy storms sometimes. We fixed it by putting a physical cover over it.