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Art.50 has already been worked overtime on transition (which it doesn't provide for at all), hence the growing feeling that extending the format on that legal basis alone isn't viable.
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So going beyond end 2020 would mean opening up a big #MFF problem that no one wants
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That points to the provisions on third-state relations, where the options are much better understood.
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UK gets more space
EU avoids a cliff-edge
Job done
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Problems. Of course.
The nature of the backstop means it'd be a mixed agt, so that means ratification by unanimity, inc those pesky sub-national parl'ts, so not quick or easy to do.
Plus you might be coming back to ratify the new relationship a couple of yrs later
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And the big political problem for UK hard Brexiters is that they might locked in this second transition
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/end