Since losing the Tories their majority at last year's general election Theresa May has been vulnerable to the whims of the various camps in her parliamentary party. If a "small cabal of MPs", as Lord Hague put it in today's paper, kicks off, they have a good chance of forcing the Prime Minister to appease them to avoid embarrassment.

The Brexiteers may have seemed like they had the run of the place. That has been clear over the last few days, with No 10 rushing to stamp on the idea of keeping Brexit Britain in a customs union (thereby limiting its trading potential) after they let their unease be known over the weekend. Their feisty talk, putting it out there for Mrs May's benefit that the "cavalry is coming" to put the "dream team" in her place, has prompted a fierce Remainer fightback.

"Unless Theresa stands up and sees off these people she is in real danger of losing huge swathes of not...