N
theres always these though
http://www.craftymomstore.com/?page_id=6&category=5
there was a spate a couple of years ago with decorative covers, I saw some that looked like ladybirds.
I've just done a test with a slimline extension lead, and sure enough, I CAN put the plug in upside down
However, looking into the N and L holes, the shutters require a second action to open them. I decided that I wouldn't test the force required, as this extension lead is currently in use
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