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>>Do most of the electrical plugs in London look like a triangle with two rectangular blades? Or are there many variations?
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>>Usually three rectangular pins (earth as well as live and neutral) rated for a max of 13amps. There's a less common round two-pin variety usually used for lighting etc...
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>Thank you for your help. I bought the power-down converter (220v to 110v) that says "London" on it so hopefully it will work.

Are you going to London? When?