Operation Yellowhammer is the codename used by the UK Treasury for cross-government "no-deal" contingency planning for the possibility that Brexit negotiations for the withdrawal from the European Union fail to reach an agreement or an extension by 29 March 2019.
Should there fail to be a negotiated settlement by that date, the UK would leave the European Union, leaving a hiatus impacting on many aspects of the relationship between the UK and European Union. The areas affected would include money, citizens, trade, customs and a range of regulations.
On 6 September 2018, a press photographer captured a snapshot of a "no-deal" planning document revealing some details of then-current preparations and the HM Treasury codename for those plans. The document appeared to indicate the Civil Contingencies Secretariat, a department of the Cabinet Office responsible for emergency planning, had been used in anticipation of government policy. No further details were revealed.
On 2 February 2019, a journalist of the London Times provided leaked documents about preparations by the Department for Transport using this codename. The documents are detailing command and control structures.
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