He has insisted that a range of options would be presented to the public, and ruled out any major changes before an election.However, the Prime Minister faces some difficulties in forging significantly closer ties with the EU.Michel Barnier, Brussels’ former chief Brexit negotiator, warned that Britain will not be able to pick and choose which elements of the European Union’s single market arrangements it wants if it decides to move closer to the bloc.EU member states would insist the UK adopt measures such as the free movement of people in exchange for easier trade, he told the BBC’s Sunday with Laura Kuenssberg.