Theresa May was accused last night by a former cabinet colleague of planning the “biggest giveaway of sovereignty in modern times”, as she faced a potentially devastating pincer movement from Tory remainers and leavers condemning her Brexit plans.

The day after Jo Johnson, the pro-remain brother of former foreign secretary Boris Johnson, resigned from the government and called for a second referendum on Brexit, former education secretary Justine Greening launched an attack on the prime minister, saying her plans would leave the country in the “worst of all worlds”.