Smith's
From Tardis Wiki, the free Doctor Who reference
Smith's was a brand of crisps.
When Susan Foreman, John Brent and Gillian Roberts broke into the Coal Hill tuck shop, all they had was cold Cadbury's chocolate, Smith's crisps and Tizer. (PROSE: Time and Relative)
Behind the scenes
The Smith's Snackfood Company is currently owned by Pepsi.