Enough MPs now understand that if the institution of parliament is ever to command respect again, Brexit must happen, and the minimally acceptable way in which it must happen is that the permanent Irish backstop goes. The only blot was the vote for the Spelman amendment objecting to ‘no deal’. But this does not bind, and the rest of the dynamic of the evening makes clear for slow learners what has been apparent to sensible people ‘out of doors’ from the beginning — the only way for Britain to win any decent deal is to make no deal a real possibility.