Which crisps are suitable for vegans?

It depends on the range.

Classic Range – all four flavours and the Mixed Case are Vegan Society certified.

Paper Range – only Sea Salt is vegan. Cheese & Onion uses real cheddar; Sweet Chilli contains buttermilk and lactose; Salt & Vinegar is vegan but contains gluten (the malt vinegar uses barley).

Always check the ingredients panel on the actual pack.