Great safety design: The UK BS 1363 power plug

Introduced in 1947 the UK BS 1363 power plug is still one of the safest plug designs:

- They always have earth connection.
- Without the earth connection, you can't inset the line and neutral pins. (the earth connection is used to open a shutter)
- New ones have insulation up to have way the line and neutral pins (to prevent you hands or objects from touching the when halfway inserted in to a socket)
- They are fused. 

A very well thought out design. Why can't so many other thing be thought out like this?

More info at:
http://en.wikipedia.org/wiki/BS_1363