Thanks everyone. I'm perfectly confident with domestic wiring (in a non-professional situation), and it's legal as it's my own house and not someone else's.
It does seem to be a grid switch; this particular design also seems to be no longer available. I've taken a photo and will get down to Screwfix or wherever later in the week to put the right combination together.
Last edited by: Dave_ on Mon 21 Mar 16 at 21:24
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