The Cabinet Office is seeking a judicial review of Baroness Hallett’s order to release Boris Johnson’s WhatsApp messages, diaries and notebooks, it confirmed in a letter to the COVID inquiry.

The Cabinet Office said it was bringing a judicial review challenge “with regret” – but added that there were “important issues of principle at stake”.

It said it would “continue to co-operate fully with the inquiry before, during and after the jurisdictional issue in question”.

The government has so far refused to hand them over in their entirety to the official inquiry – and the deadline to do so expired at 4pm today.

Outlining its refusal to hand over the material in a letter to the inquiry, the Cabinet Office questioned whether it had “the power to compel production of documents and messages which are unambiguously irrelevant to the inquiry’s work”.

Such materials include personal messages and “matters unconnected to the government’s handling of COVID”, it said.

It argued that requesting “irrelevant” material “represents an unwarranted intrusion into other aspects of the work of government”.

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“We consider there to be important issues of principle at stake here, affecting both the rights of individuals and the proper conduct of government,” it said.

It said it had explored “a number of possible avenues for resolving this difference of opinion”, including offering redacted versions of the materials and “a more focused or sequential approach to the direction of the information requirements”.

“We remain hopeful and willing to agree together the best way forward.”

The Cabinet Office went on to say that while it had chosen a judicial review over providing the documents requested by the inquiry, it nevertheless wanted to “provide as much relevant information as possible, and as quickly as possible, to assist the work of the inquiry”.

Inquiry chair Lady Hallett ordered the government to hand over the documents last week – without any amendments.

The tranche includes messages sent between former prime minister Mr Johnson and his fellow ministers and advisers during the pandemic, as well as diary entries.

The inquiry confirmed on Thursday afternoon that it had received a response from the Cabinet Office in relation to section 21 notice it had issued regarding the documents.

In a short statement, it said: “At 4pm today the chair of the UK COVID public inquiry was served a copy of a claim form by the Cabinet Office seeking to commence judicial review proceedings against the chair’s ruling of 22 May 2023.”

Further information will be provided at a preliminary hearing at 10.30am on 6 June, it added.

On Wednesday afternoon, Mr Johnson’s team said all the information the inquiry wanted had been passed to the Cabinet Office.

His spokesman said the ex-prime minister wanted the Cabinet Office to “urgently” hand over the material, in a move that put pressure on Rishi Sunak and the government to hand over the documents.

“While Mr Johnson understands the government’s position, and does not seek to contradict it, he is perfectly happy for the Inquiry to have access to this material in whatever form it requires,” the spokesman said.

“Mr Johnson cooperated with the Inquiry in full from the beginning of this process and continues to do so. Indeed, he established the Inquiry. He looks forward to continuing to assist the Inquiry with its important work.”

Responding to the judicial review, Labour’s deputy leader Angela Rayner said: “While the rest of the country is focused on the cost-of-living crisis, Rishi Sunak hopelessly distracted with legal ploys to obstruct the Covid Inquiry in a desperate attempt to withhold evidence.

“After thirteen years of Tory scandal, these latest smoke and mirror tactics serve only to undermine the Covid Inquiry. The public deserve answers, not another cover-up.

“Instead of digging himself further into a hole by pursuing doomed legal battles to conceal the truth, Rishi Sunak must comply with the Covid Inquiry’s requests for evidence in full. There can be no more excuses.”

Daily Cooper, the deputy leader of the Liberal Democrats, also criticised the government’s decision to launch a judicial review, calling it a “kick in the teeth” for bereaved families.

“This cowardly attempt to obstruct a vital public inquiry is a kick in the teeth for bereaved families who’ve already waited far too long for answers.

“Rishi Sunak’s promise to govern with integrity and accountability has been left in tatters.

“The government is delaying the inquiry even further and clogging up court time, all to prevent Sunak and his Conservative colleagues from having to release their messages.”

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