Green’s Dictionary of Slang

1. a key.

1992		R. Puxley Cockney Rabbit.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.

2. (Aus.) a television, i.e. TV, thus a television show.

1996

J. Byrell Liars, Urgers & Coat-Tuggers 227: And she’d starred as an extraterrestrial sheila in eight episodes of that grand old knobbly, ‘Dr Who’.