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The 'cost' statistics from all sides of this argument (granted this comes over a lot more from one side than all of the others put together) just seem to be a big game of 'What can I get away with including and what can I justify leaving out with just the most tenuous of reasons to suit my own argument?'. Sadly I can't recall I have seen something that looks reasonably considered and we are how far down the line?
https://globalbritain.co.uk/new-brexit-paper-puts-the-real-cost-of-eu-at-nearly-one-billion-a-day/