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Britain is to rejoin the Horizon Europe science research programme, Prime Minister Rishi Sunak's office and the European Union said on Thursday, after UK scientists were frozen out in a post-Brexit row.

Scientists welcomed the agreement as "a great day for researchers in the UK and across Europe" and a relief after two-and-a-half years of "uncertainty", raising hopes among anti-Brexit campaigners of further closer collaboration with the EU.

London had said it had been excluded from the scheme that funds research projects due to wrangling with Brussels over post-Brexit trading arrangements in Northern Ireland.

But following a call on Wednesday, Sunak and EU Commission President Ursula von der Leyen announced that Britain was rejoining under what was billed as a "bespoke deal".

Nobel laureate Paul Nurse, director of biomedical research centre at the Francis Crick Institute, said he was "thrilled to finally see that partnerships with EU scientists can continue".

The government said rejoining Horizon would give the country's scientists "unrivalled opportunities" at a good price for British taxpayers.

The EU estimates that the UK will contribute almost 2.6 billion euros (£2.2 billion) per year on average to Horizon Europe and Copernicus satellite monitoring system, from January 1 next year.

But it will not have to pay for the time it was locked out of the programme.

"As part of the new deal negotiated over the last six months, the Prime Minister has secured improved financial terms of association to Horizon Europe that are right for the UK," a statement said.

Von der Leyen said the EU and the UK were "key strategic partners and allies and today's agreement proves that point".

"We will continue to be at the forefront of global science and research,” she added.

- 'Great day' -

The deal means that UK researchers can apply immediately for grants and bid to take part in projects under the Horizon scheme, which is the world's largest civil research and innovation programme.

It has a budget of 95.5 billion euros from the 27-member EU alone, and contributions from associated partner countries, funding research into areas such as health crises and climate change.

Under the new deal, the UK will not be involved with the bloc's nuclear technology scheme, Euratom.

Instead it will "take forward its own fusion energy strategy"," Downing Street said.

The announcement was given an enthusiastic welcome across the UK scientific community.

"This is a great day for researchers in the UK and across Europe," said a joint statement by the Academy of Medical Sciences, the British Academy, the Royal Academy of Engineering and the Royal Society.

"The Horizon programme is a beacon of international collaboration and UK-based academic and industrial researchers will now be back at the heart of that," they added.

- Obstacles -

Cancer Research UK chief Michelle Mitchell said the EU and UK should now "work with urgency to rebuild the strong position the UK occupied in the Horizon programme".

"There will be relief throughout the research community that the uncertainty of the last two-and-a-half years has come to an end," she said.

The UK government launched dispute proceedings against the EU last year over its exclusion from Horizon, considering it a breach of the Brexit trade deal it signed in December 2020.

It argued that its inability to participate in science and technology programmes was causing "serious damage" both in the UK and EU countries.

But the EU maintained that it was not obliged to make the UK an associate member on such programmes, and refused to allow membership until London honoured its commitments under the deal in full.

The EU said a new deal struck for trade in Northern Ireland "allowed association talks to resume. Therefore it is now time to move forward with the final steps for associating the UK".