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Complicating factor;
2019 sees an-EU wide election of the European Parliament.
One of the deciding factors for sending the notification of A50 letter,
was to ensure, from a brexitty viewpoint, 'We were out before this election'
and,
did not get caught up in the next 5-Year EU Budget.
ERG/gammons already frothing over the £39bn payment to resolve our obligations,
imagine their demeanour were we to sign up for 'normal' payments for another year,
(if the EU27 agreed to such temporary membership)?
So if the current government remains in power, it's no-deal or a referendum or a second parliamentary vote much closer to B-day.
In the unlikely event of a GE and Labour coalition win, B-day is kicked down the road while the new govt negotiates a new agreement and we're probably right back here in January 2020?