[JadeNB]

> UK is probably the safest but it’s also bulky and presents an unlikely kind of danger: it tends to lay with the pins upward when on the floor which is deadly when stepping on them in the dark.

A feature mentioned even in an article praising them as the best in the world (https://www.fastcompany.com/3032807/why-england-has-the-best...), linked elsewhere by dpeck (https://news.ycombinator.com/item?id=21678124):

> It’s a truly brilliant design. The only caveat is that, as with Lego, the rugged, bottom-heavy design of a U.K. plug makes it an almost scientifically perfect caltrop.