Barnier: UK can change mind on single market until end of 2020
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Michel Barnier is leading the Brexit negotiations for the EU
The UK has until the end of 2020 to change its mind about leaving Europe's single market, the European Union's chief Brexit negotiator has said.
Michel Barnier said that if the UK changed its "red lines" during the post-Brexit transition period, the EU would also change its position.
Theresa May says the UK will quit the EU single market and customs union.
She says this is needed to ensure the UK has the power to control borders and do trade deals with other countries.
The UK is set to leave the EU in March 2019, at which point the transition phase - which the UK government calls the implementation phase - will begin. This will last until 31 December 2020, when the final arrangements agreed between the two sides will kick in.
Negotiations are under way between the two sides, but the UK has already said it plans to leave the single market, which provides for frictionless trade across borders and involves the free movement of people between member states.
In an interview with reporters from several European newspapers, Mr Barnier said the UK would not leave the single market and customs union until 31 December, and until this date, "everything is possible".
"If the UK wanted to change its red lines, we would therefore change ours," he said.
Mr Barnier added that he was not expecting this to happen, but that the EU would not be dogmatic.
He suggested the UK could follow a similar model to Norway, which has access to the single market in return for a financial contribution, accepting EU law and allowing the free movement of people.
'Revealing comments'
BBC Brussels correspondent Adam Fleming
This is one of those moments where Michel Barnier says things he has said before but in a way that is revealing about how the rest of the Brexit process will unfold.
The EU doesn't think the future relationship with the UK will be finalised by the date of its departure on 29 March 2019.
Which means that during the transition/implementation phase the UK could change its mind - quite significantly - about what it wants and then negotiate on that basis.
It also suggests that the EU wants the document sketching out the shape of the future relationship which will be agreed during the next phase of talks this year to be very, very open - not the detailed blueprint the British government seeks.
On the current trajectory, the UK will be out of the EU in 2019 but the arguments about whether it should remain in the customs union and the single market could carry on right up until a deal on the future relationship is sealed.
The UK government says it wants a comprehensive, bespoke free trade trade deal with the EU to replace its single market membership.
It wants to agree this by the Autumn in time for a "withdrawal agreement" to be ratified by the UK and EU Parliaments by March. But the EU has suggested only a "political declaration" will be possible by this deadline.
On Tuesday, the European Council's president said Brexit makes him "furious".
Speaking in Dublin, Donald Tusk said the UK's departure from the EU was "one of the saddest moments in twenty-first century European history".