Boris Johnson is deliberately whipping up fears of riots and deaths so he can try to invoke emergency powers and avoid extending the UK’s EU membership beyond 31 October, Labour’s Brexit spokesman, Keir Starmer, claimed on Saturday.

After a week in which the prime minister was accused by MPs from all the main parties, including senior Tories, of inciting violence by accusing Remainers of Brexit “surrender” and “betrayal”, Starmer said it was part of an orchestrated plan to stoke a sense of outrage among Leave voters and create civil unrest, so an extension might be avoided.