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The government's official No Deal Brexit emergency plan Operation Yellowhammer will be activated on Monday, it is reported.

Brexit Secretary Steve Barclay wrote to Cabinet announcing the worst-case scenario will be implemented from next week, according to the Daily Telegraph.

Yellowhammer - which enables a "command and control" system to prevent runs on food, fuel and banks - could still be called off if a Brexit delay is agreed with the EU by Monday.

But EU chief Jean-Claude Juncker today warned no agreement is likely at a summit this Thursday, with EU leaders only likely to come up with something next week.

"As long as we don't know what Great Britain will say Yes to, we can't come to a resolution," the European Commission President said.

(Image: Getty Images)

According to the Telegraph, Mr Barclay wrote to ministers in yesterday's Cabinet meeting with details of the plan.

Operation Yellowhammer command and control structures will be enacted fully on March 25 unless a new exit date has been agreed between the UK and the EU," he is said to have written.

"If an extension is confirmed... it will mean maintaining no deal scenario as operational focus.

"Cabinet will subsequently need to decide whether to futher intensify or scale back efforts, depending on length of extension."

Commons Leader Andrea Leadsom today confirmed the plan was discussed in yesterday's meeting of the Cabinet.

(Image: Getty Images)

She said the date is "obviously contingent" on Brexit plans and "it comes into operation should the UK leave without a deal."

She told LBC Radio: "It’s the project that is preparing in the event of no deal for making sure essential services and systems and processes continue to work.

"As you would expect, any competent government prepares for all eventualities."

The Mirror reported shock details of Operation Yellowhammer last year.

Under the plans, councils were being warned to prepare for three months of disruption in a no deal Brexit.

(Image: South Wales Echo)

Town hall chiefs were told to plan for "reasonable worst case scenarios" including runs on food, petrol and the banks.

They were preparing to report to central government every eight hours - and were told they could have to cancel leave over Easter.

Dozens of Local Resilience Forums, which bring together councils, emergency services and the NHS, are aiding Whitehall’s No Deal plan Operation Yellowhammer - which is led by the same officials who would deal with a flu pandemic.