Brexit: What you need to know on eve of article 50 trigger

What to expect as May prepares to begin the two-year process of Britain leaving the EU

British prime minister Theresa May will trigger Britain's withdrawal from the European Union under article 50 of the EU treaty on Wednesday. The UK should then be out of the bloc in two years.

Here is a timeline of the process, based on a mixture of public information and estimations by EU sources:

The trigger

Wednesday, March 29th: Just after noon in London, EU officials believe, Ms May should tell parliament that her letter to European Council president Donald Tusk notifying him formally of Britain's intention to leave has just been delivered.

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EU officials expect a signed letter of several pages to be hand delivered from Britain’s EU embassy across the street. They think it will offer a positive tone on talks and recap 12 key points which May set out as her goals in a speech on January 17th.

Summit, guidelines, recommendations

Friday, March 31st: Within 48 hours after reading the letter, Mr Tusk will send the 27 other states draft negotiating guidelines. He will outline his views in Malta, where from Wednesday he will be attending a congress of centre-right leaders. Brussels envoys of the 27 - Coreper - meet in Brussels to discuss Mr Tusk's draft.

April 11th: Government EU advisers from the 27 members are expected to meet in Brussels to discuss guidelines. They are expected to meet again on April 24th for further revisions.

April 27th: EU affairs ministers of the 27 - General Affairs Council or GAC - meet in Luxembourg to prepare EU27 summit.

Saturday, April 29th: EU27 leaders meet in Brussels to agree guidelines and mandate Michel Barnier as chief negotiator.

Tuesday, May 2nd: After May Day holiday, Mr Barnier is likely to go back to the council with his recommendations for how negotiations should be structured, seeking the governments’ approval.

Directives

May: The GAC will meet, again excluding Britain, to agree legal “negotiating directives” to bind Mr Barnier. The GAC has a routine meeting scheduled on May 16th, but could meet at any time.

Face to face

Finally, after nearly a year since the June 23th referendum vote to leave, British negotiators led by David Davis will sit down with Mr Barnier’s EU team. This may well happen soon after the April 29th EU summit. Full negotiations must wait until EU governments sign off on the directives but both can save time by fixing procedural arrangements - who will meet whom where, speaking what language, and so on - once Mr Barnier has a mandate.

Once the 27 governments have signed off on the directives, negotiating teams will start talks, each tackling certain areas.

The divorce deal

December 2017: Brussels wants a basic deal on a Withdrawal Treaty by year’s end. The key issues are: the exit bill for Britain’s outstanding commitments; treatment of British and EU expats; dealing with outstanding EU legal cases; new border rules.

Transition to future relationship

2018: Ms May wants to negotiate a comprehensive free trade deal. Few see two years as enough time to agree one and Brussels wants to hold off starting talks until after a divorce deal. But London and some EU states may push for parallel trade talks. Most diplomats expect some synthesis of the two approaches.

October 2018 : Mr Barnier’s target to finalise the Withdrawal Treaty, to give time for ratification by the European parliament and a majority in the European Council by March 2019.

Autumn 2018 to Spring 2019: Just to make it complicated, the Scottish government wants an independence vote once a Brexit deal is clear. But, Ms May has so far rejected the call for a new Scottish referendum until after Britain leaves the EU.

B-day

March 29th, 2019: Britain leaves. At any rate, it should do so exactly two years after Ms May sends the article 50 letter. As it happens, this Friday is the last business day of the quarter.

The date could be fine-tuned. Britain could leave earlier if it gets a deal, and the two-year deadline can be extended if all agree. However, Brussels wants Britain out before EU elections in May 2019. Despite mutual threats of no deal, few want such chaos.

A period of transition

Ms May and EU leaders say transitional arrangements may well be needed, to give more time to agree a future trade deal and give people and businesses time to adjust to the divorce. Many see another two to five years after Brexit for a final settlement.

If Scotland votes for independence, expect more years to negotiate its split from London and possible re-entry to the EU.

Reuters