"You didn't learn that at Eton!"
In TNA The Last of the Cybernauts...?? Laura quickly realizes, that Steed is an excellent player and he confirms to her that he spent too much time playing billiard when he was a younger man.
There's a billiard room in Steed's mansion, where he's playing either alone or with friends in TNA The Last of the Cybernauts...?? and The Three Handed Game, when he plays a match with Gambit.
He declared to be a bit rusty, but Steed played billiard at the social evening with Graham in series 2 Traitor in Zebra, in the series 6 episode The Curious Case of the Countless Clues, with Mother (at Mothers home?) in Bizarre and at a pub a sort of billiard in series 2 School of Traitors.
Traitor in Zebra
The Curious Case of the Countless Clues..
TNA Three Handed Game
TNA The Last of the Cybernauts...??