Theresa May must adopt an Australian points-based immigration system by 2020 or face a backlash from Brexit voters, two former cabinet ministers have said.

Theresa Villiers, the outgoing Northern Ireland secretary, said in an interview with The Telegraph that the country voted to end the “free for all” of “open door” immigration at the referendum.

Iain Duncan Smith, the former work and pensions secretary, also said that people are "living in cloud cuckoo land” if they think voters did not choose complete control of their borders by backing Brexit.