Recliner writes:

Apologies if this is old news, but I noticed yesterday that the Kings
Cross departures board now shows ECML Thameslink departures from St
Pancras:
https://www.flickr.com/photos/recliner/49423851683/in/dateposted-friend/lightbox/

I can't recall other instances of UK rail stations also showing
departures from other, adjacent stations, but perhaps there are some
that I'm not aware of.

Coulsdon South shows departures from Coulsdon Town on a separate,
dedicated screen.
--
Ian ◎