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If you're deciding you want to make your own rules, and you still want access to the European markets, that's a tricky negotiation and I don't see any way that that can be concluded by the end of next year, if Boris Johnson's serious and Boris Johnson says,' right, we're going to legislate that we're out no matter what in 2020,' Boris Johnson's going to find that very difficult unless Boris Johnson's prepared to make a lot of concessions to Europe.