Not sure about London, but spices etc. are usually cheaper from Indian/ Pakistani supermarkets round here. Even so, the health food shops and the like are usually not too bad, I don't suppose you'll be buying them by the hundredweight. Chilis usually come in jars rather than cans if you don't want fresh. I'd never put bay leaves in anything, as I've never found it does anything, maybe I'm missing a gene for it or whatever. I've never seen MD wine, but then I don't live in London, but kosher wine is available in most larger supermarkets. What's marshmallow fluff?