The EU has toughened its Brexit negotiating stance as two of the bloc’s most senior figures head to Downing Street to meet Theresa May.

A new sentence in the European Council’s draft negotiating guidelines to be approved at a summit this weekend, indicates Brussels will demand all EU citizens who have lived in the UK for five years acquire permanent residence rights.

The Prime Minister will receive EU Commission President Jean-Claude Juncker and his chief Brexit negotiator Michel Barnier for dinner at No 10 on Wednesday evening when the guidelines will be discussed.

The hardening of language is all the more significant because EU figures are demanding the European Court continue to guarantee EU citizens’ rights after Brexit, despite Ms May’s plans to make ending the Luxembourg court’s influence an election pledge.

The new paragraph in the guidelines relating to EU citizens emerged in the last 24 hours and states that guarantees of rights given by the UK must be “effective, enforceable, non-discriminatory and comprehensive, including the right to acquire permanent residence after a continuous period of five years of legal residence.”

The document then adds: “Citizens should be able to exercise their rights through smooth and simple administrative procedures.”

The Independent first reported the Downing Street visit by top EU figures earlier this week, with officials saying it would be used by Mr Juncker to officially present Mr Barnier as the front-man in Brexit talks, due to begin after the British general election.

The EU guidelines will also be discussed, as they are set to be formally approved by the remaining 27 EU states on Saturday.

In pictures: European parliament Brexit discussions Show all 12 1 /12 In pictures: European parliament Brexit discussions In pictures: European parliament Brexit discussions European commission member in charge of Brexit negotiations with Britain, French Michel Barnier listens at the President of the European Commission Jean-Claude Juncker speaking at the European Parliament in Strasbourg Getty Images In pictures: European parliament Brexit discussions Frank-Walter Steinmeier, President of the Federal Republic of Germany, delivers his speech at the European Parliament in Strasbourg EPA In pictures: European parliament Brexit discussions European Union's chief Brexit negotiator Guy Verhofstadt, President of the Group of the Alliance of Liberals and Democrats for Europe (ALDE), addresses the European Parliament during a debate on Brexit priorities and the upcomming talks on the UK's withdrawal from the EU Reuters In pictures: European parliament Brexit discussions Michel Barnier, European Chief Negotiator for Brexit reacts during a meeting at the European Parliament in Strasbourg EPA In pictures: European parliament Brexit discussions Member of the European Parliament and former leader of the anti-EU UK Independence Party (UKIP) Nigel Farage wears socks with Union Jack flag at the European Parliament in Strasbourg Getty Images In pictures: European parliament Brexit discussions Nigel Farage, United Kingdom Independence Party (UKIP) member and MEP, addresses the European Parliament during a debate on Brexit priorities and the upcoming talks on the UK's withdrawal from the EU Reuters In pictures: European parliament Brexit discussions European commission member in charge of Brexit negotiations with Britain, French Michel Barnier gestures during speeches at the European Parliament in Strasbourg Getty In pictures: European parliament Brexit discussions The President of the European Commission Jean-Claude Juncker (L) speaks with European commission member in charge of Brexit negotiations with Britain, French Michel Barnier at the European Parliament in Strasbourg Getty In pictures: European parliament Brexit discussions European Union's chief Brexit negotiator Guy Verhofstadt, President of the Group of the Alliance of Liberals and Democrats for Europe (ALDE), addresses the European Parliament during a debate on Brexit priorities and the upcomming talks on the UK's withdrawal from the EU Reuters In pictures: European parliament Brexit discussions Member of the European Parliament and former leader of the anti-EU UK Independence Party (UKIP) Nigel Farage gestures during speeches at the European Parliament in Strasbourg, eastern France, on April 5, 2017. The European Parliament will on April 5 lay down its "red lines" for negotiations over a Brexit deal, on which the assembly will have the final say in two years' time. / AFP PHOTO / Sebastien BozonSEBASTIEN BOZON/AFP/Getty Images Getty In pictures: European parliament Brexit discussions German president Frank-Walter Steinmeier delivers a speech during a plenary session at the European Parliament in Strasbourg Getty In pictures: European parliament Brexit discussions The European Parliament in Strasbourg, eastern France Getty Images

But the toughening in language on EU citizens' rights follows a row over how European nationals are being treated by the Home Office in the run up to Brexit.

EU citizens uncertain of their status have rushed to confirm their residency, but have complained of a complicated and long application procedure, red tape and high costs, to the extent that MEP Sophie In't Veld set up a taskforce to tackle the issue.

She said she was delighted at the hardening of language in the EU Council’s Brexit guidelines, adding: “UK ministers seem to be living in a parallel universe to those who are actually applying for residence and attempting to exercise their fundamental rights.

“The anxiety of millions of EU citizens does not appear to be very high on the priority list of Mrs May.”

After writing a letter of complaint to the UK Government, Immigration Minister Robert Goodwill responded to her saying that he was concerned about the issue.

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He added: “There is absolutely no question of the UK treating EU citizens with anything other than the utmost respect, nor acting in any way contrary to EU law.”

But the European Parliament has stated it could veto any deal that did not guarantee EU citizens' rights, while the EU Council has signalled the European Court of Justice should maintain its role as guarantor of those rights.

Ms May meanwhile is set to make ending the court’s role a key election pledge, along with ending EU free movement and pulling out of the single market.

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The EU guidelines to be approved at this weekend’s summit have already been toughened in other areas, with sherpas having approved a French bid to strengthen the language on financial services.

The sector is now mentioned separately from wording on an overall trade deal, with diplomats inserting a new paragraph stating that “any future framework should safeguard financial stability in the Union and respect its regulatory and supervisory standards regime and application.”