The future of Theresa May’s Brexit compromise plan — and her survival as prime minister — is at the mercy of a complex web of parliamentary and cabinet factions all of whom, as they say in Westminster, are “on manoeuvres”.

The prime minister’s lack of majority makes her vulnerable to an ambush from any side. So how do the factions break down and what power do they wield?

Labour’s Chuka Umunna and the Tory Anna Soubry put party division aside for the People’s Vote march through London on Saturday MIKE KEMP/GETTY IMAGES

Sceptical cabinet waverers

A powerful group including the home secretary Sajid Javid, the foreign secretary Jeremy Hunt and attorney general Geoffrey Cox. In a divided cabinet the prime minister cannot pursue any strategy or make any trade-off without their backing. In the past few days they have been instrumental in shaping the internal debate over Brexit