There are a few types of Funyuny-type crisps here, not an exact match but close enough. Look for the 10p packets for those.
McCoy's Mexican Chili is lovely, and so is the Doritos Mexican Chili.
Doritos does the best plain ('ready salted') tortilla chips for salsa & nachos.
Walkers BBQ Ribs are GORGEOUS. Really, really lovely.
Does anyone else hate that you can't get a big ol bag of chips and you end up eating like, 6 of those little packets and feel like a total cow doing so?