Taste test: These are good ketchup chips.
They've got a medium-strength ketchup flavor on the standard thin Walkers chips. Unlike many American and Canadian varieties of ketchup chips, they don't have red-colored flavor powder all over them; instead, there are just a few (very few) specks of red that you might not even notice. So now I'm figuring that all the red on those other chips is actually just for show.
Smell test: Mild ketchup/vinegar aroma.
From the package: “Ingredients: Potatoes, vegetable oil, tomato ketchup flavour [flavouring, flavour enhancer (monosodium glutamate), lactose], salt.” ... “Is there a £20 note inside?” (Nope.)
Online store: Buy potato chips on Amazon
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This snack was discovered by Jeremy in London.