Beer (Ale not Lager),
Stock cubes (Kallo Organic),
Veg (from Andy and Jilda in the Market),
Milk (full cream organic, or if I need milk on a Saturday it'll be from the farmer's market),
Coffee (never the cheapest but never the most expensive, at the moment I go for an Organic one I think it's from Peru),
EDIT: Looks at what other's have said;
Brown Sauce, must be HP, must be from a glass bottle, and there must be a spare bottle in the house.