On Sun, 28 Jul 2013 14:34:48 +0100, Graham. wrote:

The Chinese wall-wart manufacturers do seem to seem to have this idea
that our 13A sockets are mounted with the earth-pin downwards, because
the regulatory labeling is often upside-down. I have several
examples.

In some ways, for a wallwart, top cable exit is preferable. For the
normal lowish level socket and device higher up (on a table) it means
the cable just goes straight up it doesn't get bent as it leaves the
wart.

--
Cheers
Dave.