‘Why doesn’t Britain get it?’ asks Barnier after spelling out some Brexit truths

He added that there will be ‘negative’ consequences to Brexit, which result from the UK’s decision to vote Leave in last year’s referendum and not from any attempt by the EU to ‘punish’ the UK.

But he said it appeared that some of those on the British side have still not understood the EU’s position and believe they can hold on to the benefits of the single market while giving up membership.

Barnier said that Brexit would create a ‘loser/loser situation’ for both the EU and UK, which would be worsened if the two sides failed to reach a deal – with the UK having ‘more to lose’ than the remaining 27 states. There was ‘no reasonable justification’ for Britain crashing out of the EU without a deal, he said.

His comments represent a stark rejection of the negotiating position set out by Prime Minister Theresa May, who has said she wants trade with the remaining EU to be ‘as frictionless as possible’ and that ‘no deal is better than a bad deal’, and Brexit Secretary David Davis, who has said he hopes a new trade deal will deliver the ‘exact same benefits’ as single market membership.

Speaking to the European Economic and Social Committee, Barnier said that Brussels had made clear to the UK that the EU’s ‘four freedoms’ – including freedom of movement – are indivisible, that there can be no sector-by-sector participation in the single market and that the EU will maintain full sovereignty over its own rules and regulations.

‘These three points were already made very clear by the European Council and European Parliament, but I am not sure whether they have been fully understood across the Channel,’ said Mr Barnier.

‘I have heard some people in the UK argue that one can leave the single market and keep all of its benefits. That is not possible.

‘I have heard some people in the UK argue that one can leave the single market and build a customs union to achieve frictionless trade. That is not possible.

‘The decision to leave the EU has consequences and I have to explain to citizens, businesses and civil society on both sides of the Channel what those consequences mean for them.

‘These consequences are the direct result of the choice made by the UK, not by the EU. There is no punishment for Brexit and of course no spirit of revenge. But Brexit has a cost, also for business in the EU27, and businesses should assess with lucidity the negative consequences of the UK choice on trade and investment and prepare to manage that.’

Failure to reach a deal on the future EU-UK relationship would mean ‘a return to the distant past’, with trade regulated by World Trade Organisation rules which would impose tariffs on goods such as vehicles, food and drink, he said.

‘No deal would worsen the loser/loser situation which will necessarily be the result of Brexit and objectively the UK would have rather more to lose than its partners,’ said Barnier.