In the Season 3 episode “Death of a Batman,” Steed breaks into Lady Cynthia’s flower shop to look for clues. While he is there, he is confronted by a very large man who is guarding the shop. After a brief scuffle, Steed manages to knock him out.
The next morning, Steed is dragged out of bed by the sound of the doorbell. He opens the door, and an effusive Lady Cynthia bounces into his flat, bearing gifts. Steed, who isn’t quite awake yet, has no idea what Lady Cynthia is so happy about.