After the past few years, it is hard to take Brexit deadlines seriously; they have a tendency to always slide to the right. But Sunday night/Monday morning really is the final deadline, as I say in the Times this morning.
There are two reasons for this. First, the Internal Market Bill and the Finance Bill are in the Commons on Monday and Tuesday respectively. Both of these bills override parts of the withdrawal agreement, and in particular the Northern Ireland protocol. The EU would fiercely object, complaining the UK was breaking its obligations under international law and pointing to how the government had itself admitted it was a ‘specific and limited’ breach. It would argue it couldn’t negotiate with a partner that behaved like this. The subsequent row would almost certainly lead to the talks collapsing.
The second is the last EU Council meeting of the year on Thursday.

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