Re: Non-binding it may be, but we're still doomed.
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Urban myth. We don't currently grow all we eat, in part because we like eating out-of-season food like asparagus at Christmas, and in part because the Common Agricultural Policy distorts production in EU countries. We're perfectly capable of growing the food we need, even if remoaners nonsensical FUD about being unable to buy from elsewhere were true.
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Even if that were true, all that food will not do us much good when it is rotting in the fields because there's insufficient seasonal immigrant labour available to harvest it.