Inside the Dominic Grieve amendment carried on Tuesday is the embryo of a new political party. Any parliamentary majority for what Sir Oliver Letwin, who voted for the amendment, calls ‘something real’ (‘Norway plus’) if Mrs May’s deal falls would depend on the support of a good many Labour MPs. After three months’ work, the organisers believe they have got 75 such on board, led by Chuka Umunna.

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