The triggering of Article 50 marks the end of the political stand-off that has been the dominant feature of British politics since the Brexit referendum last June: a stand-off between our elected representatives on the one hand and “the will of the people,” as expressed in the referendum vote, on the other. Between the end of June and the end of March, any party with something to lose has had to go along with a show of respecting the referendum result, whatever they thought of it. Scotland too, although this has a different tint there. (The obvious exception is Tim Farron’s Liberal Democrats, but in 2016-17 they have nothing left to lose.)
So politics can start up again now, with differences on the terms of Brexit, and we saw this as early as last Sunday, when Labour’s Keir Starmer popped up on the Andrew Marr show to make a robust defence of “soft Brexit”, and on Wednesday when by all accounts Andrew Neil gave May the toughest interview of her Prime Ministerial career.
It’s also the last point at which May has any control of her Premiership, and there must be a question about how many of her senior civil servants have pointed this out to her and her ministers over the last few months.