Britons could be offered “associate citizenship” of the European Union after Brexit even if Theresa May blocks the plan, the MEP who drafted the proposal has said.

“Associate citizenship” remains a “realistic” ambition and Brussels should make it available to UK nationals even if the British Government vetoes the plan during negotiations, Charles Goerens said.

Commenting in the wake of the Government’s Brexit White Paper, he said he was increasingly hopeful that his proposal would be offered to the UK once it quits the bloc.

In November, The Independent revealed that a plan for “associate citizenship”, proposed by Mr Goerens, was being considered by the European Parliament.

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It would allow UK nationals who applied for EU citizenship to work anywhere inside the union as well as giving them a vote in European Parliament elections – while retaining their British passport.

The Luxembourg MEP said there was no real opposition to the policy from his fellow lawmakers in Brussels and Strasbourg, who will be given the final say on the Brexit deal in a vote at the European parliament.

And he said the EU’s negotiators should make it a red line in future discussions, adding that eventual treaty change was in the interests of those on both sides of the Channel.

The proposal has offered hope to many who fear Britain is closing itself off from Europe and the opportunities it provides.

Ms May outlined the Government’s negotiating position in a speech at Lancaster House in January, followed last week by a Government White Paper.

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Mr Goerens said the Prime Minister’s remarks were “very positive” and showed she understood there was a “real problem” for Britons living both in the UK and Europe.

“Theresa May’s proposal is a step in the right direction,” he told The Independent in a phone interview from Brussels.

“The White paper was a clear signal that I was not totally unrealistic by launching the idea of European ‘associate citizenship’.

“It is for technical reasons that she wasn't more outspoken on this issue.

“She sent a clear signal that she has understood that there is a real problem. Let’s not be too pessimistic about that."

Brexit protest: Thousands march in London Show all 12 1 /12 Brexit protest: Thousands march in London Brexit protest: Thousands march in London A woman poses with a home-made European Union flag as Remain supporters gather on Park Lane in London to show their support for the EU in the wake of Brexit PA Brexit protest: Thousands march in London Remain supporters demonstrate in Parliament Square PA Brexit protest: Thousands march in London Tens of thousands of people gathered to protest the result of the EU referendum PA Brexit protest: Thousands march in London A majority of people in the capital voted to remain in the European Union Reuters Brexit protest: Thousands march in London Protesters chanted: “What do we want to do? Stay in the EU” PA Brexit protest: Thousands march in London The march follows a similar rally in Trafalgar Square that was cancelled due to heavy rain – but which tens of thousands of people turned up to anyway Reuters Brexit protest: Thousands march in London Britain voted to leave the European Union in a referendum by 52 per cent to 48 per cent Reuters Brexit protest: Thousands march in London But support for the Leave campaign in urban areas and among young people was significantly lower Rex features Brexit protest: Thousands march in London Marchers gathered at Park Lane at 11am and marched towards Parliament Square PA Brexit protest: Thousands march in London Some protesters held up baguettes in a display of affection for our continental neighbours PA Brexit protest: Thousands march in London The disparity between different parts of the country has promoted a four million signature petition calling for a second referendum and even a renewed push for Scotland to cede from the UK PA Brexit protest: Thousands march in London The event’s organiser, King’s College graduate Kieran MacDermott, wrote: “We can prevent Brexit by refusing to accept the referendum as the final say and take our finger off the self-destruct button" Reuters

“European ‘associate citizenship’ is still on the agenda of the European Parliament,” he continued.

“You can say on the one hand that it is not a solution that would be in line with today's legislation, with European law, but on the other hand if there is a political will we can overcome the obstacles to it.

“We can have treaty change, we can have political process on the conviction that European citizenship, or ‘associate citizenship’, is in everybody’s interest.”

If the proposal is included in the final Brexit deal that MEPs will vote on at the end of the two year negotiating period, Mr Goerens said he was confident it would be passed.

“As far as I see, there is no real opposition unless you talk to the right-wing parties represented in the European parliament, and some fanatic Brexiteers,” he said.

The Government’s Brexit White Paper lays out the plan for Brexit (Reuters)

“It is up to politicians to react and to take initiative. It is up to us to move the lines, we are not only the observers, we are the actors.

“The European Parliament will have the last say on the arrangement between the European Commission and the UK, we have a good opportunity to make clear our views on what should be the outcome of this process, and one of the outcomes is the status of people most negatively affected by Brexit.”

Opposition to the plan may come in the form of hard-line Eurosceptics, who claim associate membership of the EU would dilute Brexit and create a two-tier system that would undermine British citizenship.

Those concerns may be enough to convince Ms May to veto the proposal from Mr Goerens and his colleagues in the European Parliament.

But the MEP said 'associate citizenship' should be offered to Britons regardless of any reciprocal offer or concession made by the UK.

He said: “Even if there were no move made in this direction by the United Kingdom, in my view we should even unilaterally offer the European associate citizenship to UK citizens because it would be in everybody’s interest to act in this way.