"We welcome the intention of the UK to do so [trigger Article 50] before the end of March 2017, so that we can begin to tackle the uncertainties arising from the prospect of the UK's withdrawal. […] We reiterate that any agreement will have to be based on a balance of rights and obligations, and that access to the Single Market requires acceptance of all four freedoms", Heads of State or Government of 27 EU member states, as well as the Presidents of the European Council and the European Commission.