The scale of the grassroots backlash against Theresa May and her Cabinet over her Brexit plans has been revealed, as the Prime Minister is warned by her own constituency chairman that she must not concede any further ground to the EU.

Cabinet ministers faced an angry response from their Conservative associations when they returned to their constituencies last week.

Seven chairmen of Cabinet ministers’ Conservative associations told The Telegraph that they either opposed the plans in their current form or would withdraw their support if Mrs May offered any further concessions to Brussels.

Richard Kellaway, the chairman of Mrs May’s Maidenhead Conservative association, said: “If it were to be diluted it would ultimately not be acceptable.”

In a sign of a growing open revolt among grassroots figures, the chairman in Andrea Leadsom’s South Northamptonshire seat said the Government had “lost the sense of leaving”, and called for Mrs May to be replaced by a “statesman”.

The warnings come after Michel Barnier, the EU’s chief negotiator, dismissed key elements of the plan signed off by the Cabinet at Chequers this month. On Saturday, Mrs May’s aides insisted that Mr Barnier had been “a good deal more positive” than reports suggested, with one stating: “The idea that he’s killed it stone-dead is for the birds.”