The electrical current in Great Britain is 220 / 240 volts (in line with the rest of Europe), 50 cycles alternating current AC (for the technical amongst you). Wall sockets take three-pin plugs and shaver sockets take two round, oversize prongs.
To use U.S. electric-powered equipment you'll need a converter and an adapter plug (or just an adapter if your appliances are dual-voltage).
Don't use 110-volt outlets marked "For Shavers Only" for high-wattage appliances such as hair dryers.
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