Hmm for chocolate it would either be Galaxy cookie crumble or a Mars Bar - I love the Dairy Milk Oreo too but that's only in a block (Would win hands down tbh!)
Sweets I'm not a huge fan of, probably Skittles.
For crisps, easily McCoys Flame Grilled Steak, but cheese and onion Squares, Nandos BBQ Piri Piri, tangy cheese Doriots and Walkers Deep Ridged steak flavour come close!