Which countries use the same plug sockets as the UK?
The official plug standard in the United Kingdom since 1962 is the BS 1363 plug. (The previous plug standard was BS 546, still found in older buildings.) The BS 1363 plug is also used in Ireland, Hong Kong, Malaysia, and Singapore.
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To save copper, Britain adopted the ring main system, with sockets connected sequentially, but this meant each connection needed its own fuse. Instead of putting the fuses in the sockets, they were included in the plugs themselves. Hence the UK's bigger plugs.
All of Europe operates on the same 2 round pronged outlets except for the UK and Ireland that operates on its own unique 3 flat rectangle pronged outlets. If you are travelling through the UK or Ireland (including London) you will need a UK and Ireland power point adapter.
It's not illegal, but there are technical standards that make it impossible in most bathrooms. Sockets are allowed in British bathrooms provided they are 3 meters or more away from the water sources (taps in the sink or bath as well as showers). Shaver-supply units are the single exception to the standard.