There were even reports Foreign Secretary Boris Johnson was preparing to oust the Prime Minister after several high-profile interventions on the negotiations with Brussels.

But the pair put on a united front yesterday – or their wax figures did – donning a Christmas Means Christmas jumper at London’s Madame Tussauds to promote Save The Children’s Christmas Jumper Day on December 15.

Edward Fuller, of Madame Tussauds London, said: “In the spirit of the festive season, we’ve brought our Theresa and Boris together with the message that Christmas really means Christmas.”

Millions of people are expected to support the charity tomorrow by wearing Christmas jumpers.

Helena Wiltshire, from Save The Children, said: “If Boris and Theresa can put the tough job of running the country [and Brexit negotiations] to one side for the day to take part in Christmas Jumper Day, then we’re hoping the rest of the country will do the same.

“All people need to do is sign up, pay £2 to take part and know that all money raised is helping the world’s most vulnerable children.”