Theresa May has been accused of silencing Eurosceptics while allowing her pro-European Bisiness Secretary to resurrect “Project Fear” over plans for a post-Brexit customs partnership with the EU.

Greg Clark, the Business Secretary, suggested that 3,500 jobs at Toyota could be at risk if the Prime Minister bowed to pressure from other members of her Cabinet and dropped the plans.

Eurosceptic ministers thought they had “killed off” the plans after a meeting of the Brexit wars Cabinet last week amid concerns that it will lead to Britain staying in the Customs Union.