Originally Posted by
schofs
It means "Club Domestic". There are Club/First desks where there were one Club desks...
I'm (currently) assuming "Club Domestic" = "Business UK" which has been around for ages/ever.
I guess they couldn't change to a 2x3 seating on Club Domestic without incurring the higher business class tax - business uk gets away with it because everyone gets the same service and seating onboard.