Boris Johnson knew this yesterday, when he emerged subdued from his home and was even more subdued at the press conference. He has been out-maneouvered and check-mated.

If he runs for leadership of the party, and then fails to follow through on triggering Article 50, then he is finished. If he does not run and effectively abandons the field, then he is finished. If he runs, wins and pulls the UK out of the EU, then it will all be over – Scotland will break away, there will be upheaval in Ireland, a recession … broken trade agreements. Then he is also finished. Boris Johnson knows all of this. When he acts like the dumb blond it is just that: an act.

The Brexit leaders now have a result that they cannot use. For them, leadership of the Tory party has become a poison chalice.

When Boris Johnson said there was no need to trigger Article 50 straight away, what he really meant to say was “never”. When Michael Gove went on and on about “informal negotiations” … why? why not the formal ones straight away? … he also meant not triggering the formal departure. They both know what a formal demarche would mean: an irreversible step that neither of them is prepared to take.

All that remains is for someone to have the guts to stand up and say that Brexit is unachievable in reality without an enormous amount of pain and destruction, that cannot be borne. And David Cameron has put the onus of making that statement on the heads of the people who led the Brexit campaign.