Test Card F

Test Card F is a test pattern that was first used by the BBC in 1967 to test color. It depicts a little girl (Carole Hersee) and her clown doll (Bubbles) huddled at a chalkboard playing a game of tic tac toe (known as naughts and crosses in England). 
In Oscar Gets An Avril Probe, Scoop stays up during midnight to watch the test card with Blane and Stewart over the phone, certain that the girl blinked. He later decides to hold a contest; whoever stays the longest receives 50 quid.
Scoop winds up winning as Blane and Stewart fall asleep, although the consequences are falling into microsleeps constantly. Oscar was having nightmares about Avril Franklin at the time and didn't participate to the contest.