A group of Eurosceptic MPs has described the Stormont brake – a key part of Rishi Sunak’s renegotiated Brexit deal – “practically useless”.

Mark Francois, chairman of the European Research Group (ERG), spoke after the group commissioned its “star chamber” of legal experts to pore over the Windsor Framework, the UK’s deal with the EU on post-Brexit arrangements when it comes to Northern Ireland.

Mr Francois said that among its initial findings were that EU law was “supreme” in Northern Ireland and that the rights of its people secured in the 1800 Act of Union had still not been restored.

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And in his harshest criticism, he said the Stormont brake – the mechanism that would allow a minority of politicians in Belfast to formally flag concerns about the imposition of new EU laws in Northern Ireland – was “practically useless”.

However, he said the ERG would meet again on Wednesday before deciding its approach to a Commons vote on the brake scheduled to take place on the same day.

The ERG’s criticisms of the Windsor Framework will be a blow to the prime minister, who had been hoping to secure widespread approval for his Brexit deal.

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While Mr Sunak does not need the votes of the DUP and ERG to get the legislation through parliament, he will not want to rely on Labour’s approval and will be looking to limit the size of any potential Tory rebellion.

The ERG’s preliminary verdict comes as little surprise after the Democratic Unionist Party (DUP) confirmed it would vote against the Stormont brake in the Commons vote.

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Sir Jeffery Donaldson DUP leader says Brexit deal ‘not sufficient’

In a statement on Monday, DUP leader Sir Jeffrey Donaldson said while the Windsor Framework represented “significant progress” in addressing concerns with the Northern Ireland Protocol, it did not deal with some of the “fundamental problems at the heart of our current difficulties”.

Sir Jeffrey said the brake “is not designed for, and therefore cannot apply, to the EU law which is already in place and for which no consent has been given for its application”.

“Whilst representing real progress, the ‘brake’ does not deal with the fundamental issue which is the imposition of EU law by the protocol,” he added.

The NI protocol was agreed as part of Boris Johnson’s “oven ready” Brexit deal and was designed to prevent a hard border in the interests of preserving the peace secured in the Good Friday Agreement.

But the protocol has led to unhappiness in the DUP, who say it has created trade barriers between Great Britain and Northern Ireland and undermined its place in the UK.

Last February the DUP pulled out of the arrangement for devolved government in Northern Ireland in protest at the protocol, effectively leaving the region without government.

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The UK and Brussels agreed the Windsor Framework as a way to incentivise the return of power-sharing in Northern Ireland and to allay some of the key concerns of Unionists.

Under the agreement there will now be a green lane for goods that are destined for Northern Ireland will no longer be subject to time-consuming paperwork, checks and duties.

But Mr Francois said that the green lane “is not really a green lane at all”.

The prime minister’s official spokesperson said on Tuesday that the Windsor Agreement was a “good deal” for the people of Northern Ireland that went “significantly beyond” the previous protocol.

The spokesperson said the Stormont Brake was a “significant step change in what had previously been agreed” and that it had dealt with the “democratic deficit” flagged by the DUP, whereby EU laws apply in Northern Ireland without the influence of politicians in Stormont.

The Stormont Brake remains the “only avenue” to change Northern Ireland’s status as being automatically aligned to EU rules, they added.

“A vote against the brake, in factual terms, would lead to automatic alignment with the EU with no say at all,” the spokesman said.