The two sides to the Brexit negotiations are the UK, as the withdrawing State, and the EU and its 27 remaining Member States (the 'EU 27').
The Prime Minister, the Rt Hon Theresa May MP, leads on the negotiations with the EU, supported by the Secretary of State for Exiting the EU. The Cabinet Office supports the Prime Minister, and the Secretary of State as her deputy, in the negotiations on the Withdrawal Agreement and the Future Framework.
The Department for Exiting the European Union (DExEU) is responsible for all of the UK Government’s preparations for leaving the EU, this includes domestic preparations in both a deal and a no deal scenario. DExEU is also responsible for all of the necessary legislation and preparations for the negotiations to implement the detail of the Future Framework.
The EU is represented in negotiations by Michel Barnier, as Chief Negotiator for the 27 EU countries. The Task Force at the European Commission coordinates the work on all strategic, operational, legal and financial issues related to the negotiations.
The UK government is working with the devolved administrations in regards to negotiations and in February 2018, Dr Andrew McCormick was appointed as Director General of International Relations, within the Executive Office to oversee the Northern Ireland Civil Service preparations for EU Exit.
A Joint Ministerial Committee on EU Negotiations, has also been established to provide a forum for each of the Devolved Administrations to contribute to the process of planning for the UK’s departure from the EU. Its meetings are chaired by the Secretary of State for Exiting the European Union and the Northern Ireland Civil Service is represented at the meetings by Dr Andrew McCormick, in the absence of a Northern Ireland Executive.
Since negotiations began, there has been intensive engagement with the UK Government at official level and with the devolved administrations in Scotland and Wales.