I've put the question mark in as I'm struggling to come up with the right Google search terms.

We have a light switch that allows us to set a variable time delay such that when the (day)light level falls sufficiently our hall and landing lights come on for however long the variable time delay is set to. So it's got a photocell light sensor, a variable delay and also is two-way working.

But it's broken.

But trying to come up with the right Google terms to see if one is still available is proving difficult.

TIA

Brilliant idea, thanks, Lec.  Keep forgetting Google images.  That was how I tracked down a replacement switch for our bedside light!  Top marks.  Found it on the top row.