Question to the Department for Exiting the European Union :

To ask Her Majesty’s Government, further to the answer by the Prime Minister on 30 November (HC Deb, col 1518) that there would be two years of negotiations on the UK exiting the EU, whether it is their intention for the UK to leave the EU at the earliest possible point, notwithstanding the two year period set out under Article 50 of the Treaty of Lisbon.

This question was answered on 14th December 2016
The process is as set out in Article 50. The precise timing and organisation of the negotiations will be a matter for discussion. It will be in everyone's interests to get a good deal agreed as quickly as possible.