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You can find a list of vegan walkers crisps here, it's about 6 months old but should be accurate.

Salt & Malt Vinegar McCoys are quite good. There's also scampi 'n' lemon nik naks and own brand...

Salt & vinegar Walkers aren't vegan anymore.

I read somewhere else that you could and that it just made it a bit more crumbly after it was defrosted.

It might be ok if it was frozen before it was sent, I dont mind attempting it but I can only get the strong cheddar flavour locally.