The findings add pressure on Mrs May to reverse her early promise not to go to the public to seek her own mandate before the next general election in 2020.

There are fears her policy of ending the ban on new grammar schools could be defeated by a handful of Tory backbenchers because of her slim majority.

With Labour in disarray and Mrs May yet to get her own mandate from the British people, calls are now mounting for her to bring the 2020 election forward.

Jake Berry, the Tory MP for Rossendale and Darwen, told The Telegraph an early election would help her pass policy changes more easily and avoid any backlash from Brexit negotiations.

“An election in 2020 would effectively be an election on the Brexit deal, which could potentially open the door to Labour if the public are not happy,” he said.