For info: I found such a device in B&Q for £4.99, manufactured by
Masterplug.

It's very similar to the one I mentioned before, except the LEDs are 2
x Amber, and hence it's not that bright - but just enough for a small
bathroom. It takes 2 x AA, and I'll see how long it lasts over the
coming weeks/months.

Cheers,


Damian