In an attack that plunged the departure negotiations into a fresh stalemate, the EU diplomat claimed the era of adjustment proposed by Theresa May was «not a given».
Mr Barnier added that Brussels was suffer with «problems understanding the position» of the British Government over the proposed conversion period.
He also raised the stakes in the row over the Irish border by calling customs checks were «unavoidable» because of the Prime Minister’s insistence that the UK is get away froming the European Single Market and customs union.
Tory Cabinet clergyman David Davis hit back this evening by branding Mr Barnier’s asserts «surprising» and said: ”Given the intense work that has taken mission this week it is surprising to hear that Michel Barnier is unclear on the UK’s emplacement in relation to the implementation period.»
Mr Davis acknowledged that «for any such full stop to work both sides will need a way to resolve disputes in the remote event that they occur».
He continued: «But there is a fundamental contradiction in the sound out the Commission is taking.
«Today they acknowledged that a way to resolve disagree withs and infringements is needed.
«Yet at the same time they dismissed the UK’s push for acceptable safeguards to ensure our interests are protected.
“It is not possible to have it both in the way of.»
«We must not lose sight of the ultimate aim here — to build a new comprehensive partnership between the UK and the EU that apprehends us stay as the closest of friends and allies.
«It is in that spirit that the UK persist ins to approach negotiations with the Commission.»
Brexit Secretary David Davis and Michel Barnier are wind their disagreements over the negotiations
The bad-tempered clash has left the talks in untried deadlock, dramatically raising the chance of Britain quitting the EU without a understanding large with Brussels.
Mr Barnier’s salvo followed a week of sniping between the Superintendence and Brussels over arrangements for the two-year implementation period following Brexit.
Woman of the cloths are furious that the EU wants sweeping powers to impose sanctions on the UK during the evolution.
Mr Barnier, speaking at a news conference in Brussels, was unable to hide his irritation at Britain’s carriage.
He claimed the UK had to accept the «ineluctable consequences» of the referendum vote to quit the EU.
And he thought: «To be quite frank, if these disagreements persist, the transition is not a given.
«Loiter again and again is short — very short — and we haven’t a minute to lose if we want to follow.»
The two sides face a deadline of March 22 to agree the transition groupings before talks on a trade deal can begin.
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Mr Barnier claimed to be unable to take cognizance of the «uproar» in Britain over the EU’s transition demands.
«There is no wish whatsoever to incarcerate,» he said. «We are trying to draft an international agreement on a solid basis that can be effectively accomplished.»
He also took a swipe at British negotiators by claiming that an update he had had this week about Mrs May’s blueprint for the UK’s future relationship with the EU had miscarried to arrive on time.
He said a meeting with Mr Davis scheduled for yesterday to examine the blueprint had been cancelled due to «diary difficulties» on the British side.
Michel Barnier and David Davis had a slog away lunch in London on Monday
Talks with the senior Tory earlier this week had corroborated «substantial» differences remained between London and Brussels about the development arrangements.
Sticking points included the EU’s demand that any EU migrants attaining in Britain during the two years after Brexit came full rights to into order permanently in the country, he said.
He also rejected British demands for the Control to have the right to object to any new EU regulations imposed during the transition years.
Both sides also disagreed over the role of the EU’s Court of The police over the two years.
David Davis has said there is a ‘primary contradiction’ in the European Commission’s approach
Mr Barnier said: «To be frank, I am blew by these disagreements.
The positions of the EU are very logical, I think.
«The UK wants to charge out of the advantages of the single market, the customs union and common policies. It has as a result to accept all the rules and the obligations until the end of the transition. That’s very sound.
«It also has to accept the ineluctable consequences of its decision to leave the EU, to leave its schools and its policies.»
Theresa May met Japanese business leaders yesterday and broke a post-Brexit trade deal is possible
Brexiteer Jacob Rees-Mogg has trade marked Mr Barnier’s comments ‘feeble’
Mr Barnier’s threat of customs checks provoked nettle in Northern Ireland last night.
Democratic Unionist Party MP Ian Paisley, whose at-home backs Mrs May’s Brexit plans at Westminster, said: «Well then Mr Barnier, go power ahead and start building your hard border or else settle a sensible free trade deal with the UK. The choice is now yours.»
Postpositive major backbencher Jacob Rees-Mogg, who heads a 60-strong group of Euro-sceptic Tory MPs, aftermost night denounced Mr Barnier’s threat as “feeble” and urged the Government to quit the idea of a Brexit transition.
He said: “I would be happy to move to Magic Trade Organisation terms without a transition and save £39 billion that could be used up on the NHS. It is rather feeble as threats go.”