Brexit timeline at a glance

What’s happened so far?

June 2016: EU Referendum. Across the UK as a whole, the vote to leave the European Union won by 51.9% to 48.1% voting to remain. In Wales, the leave vote was 52.5%.
29 March 2016: UK invokes Article 50 of the Treaty on European Union
19 June 2017: Brexit negotiations talks begin between the UK and the EC.  Any deal will need approval from at least 20 countries with 65% of the population.
25 November 2018: The Withdrawal Agreement was endorsed by the European Council.
15 January 2019: The Prime Minister loses the ‘Meaningful Vote’ and the Leader of the Opposition tables a motion of no confidence in the Government.

What Next?


29 January: MP’s to vote on plan B of the withdrawal agreement, and amendments to the process for agreeing a deal, including an extension of the Article 50 process.
February 2019: MPs to vote on the deal in the House of Commons.  This could be repeated if necessary to win a meaningful vote, provided significant changes are made. Potentially, MP’s could agree:

  • To leave the EU without a deal
  • To seek an extension of Article 50
  • To hold another referendum
  • To make a final effort at negotiations
26 February: The proposed deadline for the government to win approval for its deal, under the Yvette Cooper amendment that will be voted on in late January. If a meaningful vote is not secured, MPs would be given a vote on whether to extend Article 50 to a date of their choosing (possibly the end of June, to fit with the schedule of European Parliament elections).
21 – 22 March: The final EU summit that the UK is expected to attend as a member of the EU
29 March: ‘Brexit Day’ – when the UK is due to leave the EU

Any Brexit deal must be approved by the European Parliament in a plenary vote. EU member states must also give the deal final approval in a ministerial meeting before it can take effect.

Negotiations can continue if all 27 leaders in the European Council agree.

If agreement is reached, a two year transition period will take place until December 2020 where some EU rules will remain, but the UK can negotiate its own trade deals.

23-26 May: Elections for the European Parliament in 27 EU countries (the UK will no longer be represented in the parliament)


31 December:  Last date of the transition period. However, this could be extended to December 2022.


For further details of the key Brexit events by the UK and Welsh Governments to date and links to key documents, see our Brexit – Key Developments page.