Sir Tim Barrow, the UK's chief permanent representative to the EU, has informed European Council President Donald Tusk's office of the move. "So Britain will exit the European Union on 29 March 2019", the Downing Street spokesperson said.
Speaking soon after the date was announced during her ongoing tour of Wales, the British Prime Minister said she would work towards getting a "good free trade deal" from the EU. There was no further detail about exactly what the letter would say at this point.
Preparations are understood to be highly advanced, with the letter to Mrs Tusk already drafted and Britain's opening demands in the Brexit negotiation prepared. May has said she wants to leave the European single market in order to be able to control immigration. Though it would give more time to both negotiating sides, EU officials claim that the United Kingdom would have to continue paying into the EU budget and being subject to rulings from the European Court of justice during that time - but these are two of the reasons why Brexiters want to leave the EU rapidly.
If all goes according to the two-year negotiations allowed for in the official timetable, Brexit should happen in March 2019.
The report anticipates the new bills will be in addition to the Great Repeal Bill, which will scrap the 1972 European Communities Act that paved the way for the United Kingdom to enter the then-European Economic Community, ending the legal authority of EU law.
The slightly awkward shots of Theresa May and Carwyn Jones at the Liberty stadium give the impression of a workmanlike relationship at best.
Theresa May froze Scottish ministers out of the process to start the UK's exit from the European Union on March 29, The Courier has learned.
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Notification comes 279 days after the referendum of June 23 a year ago delivered a 52 to 48 per cent majority in favour of withdrawal.
London says the Brexit process is irreversible once Article 50 is triggered, although experts have said there is no legal ban on member states changing their minds before leaving the EU.
Mrs May will meet First Minister Carwyn Jones as well as leaders in business and other areas, and will be accompanied by Brexit Secretary David Davis and Welsh Secretary Alun Cairns.
"I have always remained firm in my belief that people did not vote to become poorer as a outcome of leaving the EU".
Her latest visit was in the driving rain of Swansea Bay as she bookends her pre-article 50 period in Downing Street with another series of visits to the devolved nations of the UK.
But Liberal Democrat leader Tim Farron, who is demanding a second referendum on when May agrees terms with the European Union, said: "Theresa May is embarking on an extreme and divisive Brexit".