Theresa May leaves a church service in her constituency of Maidenhead this morning

Theresa May has 10 days to save her premiership after she was put on notice to “shape up” and show she is fit to lead.

Confidence in the prime minister is in free fall in Tory ranks as constituency party bosses told ministers and MPs to force her from power. Up to a dozen MPs are ready to demand a vote of no confidence in May by submitting letters to the backbench 1922 committee.

Their ranks are expected to swell this weekend as MPs consult grassroots grandees about May’s faltering response to the Grenfell Tower inferno in west London.

Cabinet ministers have also let it be known they will oust the prime minister if it looks as if she is in danger of losing the