The UK power plug (and its matching socket) is incredibly safe, just as you’d expect from a country that only allows half-voltage sockets in bathrooms (bathrooms also get string-activated light switches lest your wet hands come near dangerous electricity). The problem is that it’s also big and bulky thanks to the mandatory inclusion of a fuse and an earth (ground) prong in every plug, even those meant for low-power use.
The Thin Plug aims to fix that.