The ultimate guide to prepping: Exactly how many tins of beans and tuna you need to survive for a week - and the condiment you'll never regret stockpiling. Top cookery writer and mother-of-three SARAH RAINEY shares her full shopping list

From severe storms to cyberattacks and hostile state activity, the nation has been told to prepare for the worst-case scenario. So what exactly should you be stocking up on?

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