Crisps are excellent just the way they arrive, and this is surely part of the point of them. But they are actually better i. straight from the oven (I mean your oven, not Mr Walker’s oven), and ii. straight from the fridge (ditto). The fridge bit I found by accident, on one of those bad storage days where you put the milk in the airing cupboard and bin the forks instead of washing them up.