Don't do it upside down. The electricity might fall out.

Whoops I think I spilled some but I quickly mopped it up!

;-)

P.S. Just make sure you don't swap the "load" and "supply" terminals, if
they are marked as such.

Well it does have the typical isolation switch symbol printed on the front

| |
0 0
\ \
| |

so does the direction have any significance, i.e. does it indicate which is
the
load?

Many thanks

Ross