What happens after Theresa May triggers Article 30 to leave the EU
29 March 2017: UK Prime Minister Theresa May is to trigger Brexit by writing to the European Union announcing the UK's intention to leave.
By 1 April 2017: The EU will give its initial response and agree guidelines for its chief negotiator.
April/May 2017: Negotiations begin - but attention is on the French Presidential elections - and how Front National's Marine Le Pen is doing - on 23 April and 7 May
24 September: German elections
September 2017 - UK Government will introduce the "Great Repeal Bill" which will incorporate all EU law into UK law for a smooth transition.
By October 2018: Negotiations between EU and UK should have concluded.
Between Autumn 2018 and Spring 2019: Nicola Sturgeon's preferred dates on referendum on Scottish independence
By March 2019: UK Parliament, European Council and European Parliament will vote on the deal
Possibly by March 2019: If all the above has gone smoothly, the UK leaves the EU.