WA2ISE:
Another way he could have built this
would be to run both cables into the
male plug.
The Brits actually sell a plug designed for just that!!
It's a white box with multiple terminals inside (kind of like a wall-wart in appeareance). I think you can connect up to 5 or so appliances to it.
Believe it's designed for things like hi-fi component rack systems (separate record player, cassette deck and radio) so you can plug them all into one outlet but you aren't expected to be unplugging them. Sure beats using a triple-tap!!
Maybe pauluk can elaborate on what I mentioned.... Paul?