UKH

Radio play - https://www.bbc.co.uk/programmes/m000qwtb

The play itself is good without being outstanding but the twist is interesting, takes you a bit by surprise and is a good illustration of unconscious bias.

Try to just listen without reading up on it first, including the synopsis on the linked page above which has the spoiler on it.

Alan

Enjoyed it too. 

I happened to be on a 2 hour car journey at the time (wouldn't normally listen to the BBCR4 afternoon play) and found it very compelling listening,  The twist made me listen even harder, and therefore became more involved.  Enjoyed it very much.  Have to ask myself if I would have listened to the whole thing if it wasn't for the twist: probably not.