Top Secret No Deal Brexit Documentation Leaked

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The extent and range of the impact of a no-deal Brexit is revealed in a confidential Cabinet Office document that warns of a “critical three-month phase” after leaving the EU during which the whole planning operation could be overwhelmed.

The classified document, seen by the Guardian, sets out the command and control structures in Whitehall for coping with a no-deal departure and says government departments will have to firefight most problems for themselves – or risk a collapse of “Operation Yellowhammer”.

“The … structure will quickly fall if too many decisions are unnecessarily escalated to the top levels that could have reasonably been dealt with internally …” the document says. It also concedes there are “likely to be unforeseen issues and impacts” of a no-deal Brexit that Operation Yellowhammer has been unable to predict.

The Cabinet Office has taken the lead in preparations for no deal and is desperately war-gaming scenarios in the event the UK leaves without a coherent plan.

The document includes a flow-chart of a routine no-deal day in Whitehall – which starts at 7am with “situation reports” from across the UK being sent to ministers and senior officials, and continues with non-stop assessments and meetings until 5.30am the following day.