From Penguin by Designers, a memory shared by Derek Birdsall:

The first D&AD show was put up on at the Hilton Hotel in 1963 I think it was, and we all paired off to put the exhibits up with a hammer and little pins. Bob Gill and I were paired off. We were putting up this cover (for Chosen Words) in place and Bob Gill stepped back and said, “Hey, that’s a great cover.” He shouted to Colin Forbes who was with Alan Fletcher in the next alcove and said, “Colin, did we do this Chosen Words cover?” Forbes shouted back, “No you ****, Derek did it!”