The head of the National Audit Office stressed that flights may be grounded during border chaos caused by leaving the EU without a deal

Ministers have been warned that 25 of the most important plans for a no-deal Brexit are in trouble, 13 of which have been labelled “off track”, The Times has learnt.

Civil servants have urged cabinet ministers to approve a significant acceleration of no-deal planning and the head of the National Audit Office, Sir Amyas Morse, said the government had put business in a “very difficult position”.

There are just over 300 no-deal “workstreams” across government to try to prevent the worst in the event that the UK crashes out of the EU, with fewer than 100 of these categorised as high priority. The “off-track” plans have not been identified.

With less than six months to go and the negotiations incomplete, Downing Street has a dilemma