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If that was supposed to be a joke rather than substitution of Walkers with something that people might recognise, I didn’t quite get it. I think the amount of talking about flavours killed any hope of a joke about brand.
I took it as being a joke about him buying the crisps from his 'dodgy friend' - since they must've been imported from abroad, as yes, otherwise they would be Walkers. I'm pretty sure that's what they were trying to get at.
 
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