The former health secretary Matt Hancock will have his personal WhatsApp and emails searched as part of a High Court battle over millions of pounds' worth of antibody test contracts.
The Good Law Project has brought legal action against the Department of Health and Social Care (DHSC), claiming that more than #80 million in contracts for antibody tests were awarded unlawfully.
The bid covers three contracts awarded to Abingdon Health which the group claims were given in April, June and August 2020 but were not published until October 2020.
"The contracts were awarded directly, and secretly, without any advertisement or competition," the Good Law Project's barrister Joseph Barrett said in written arguments.
The group also argues that the contracts "comprise very substantial unlawful public subsidies".
On Tuesday, the group asked the High Court to order searches of Mr Hancock's Government email accounts and his "non-Government communications systems" used for Government business - thought to include WhatsApps.
Mr Hancock, the MP for West Suffolk, had been health secretary since July 2018 until he resigned in June after photos of him kissing an aide in his departmental office, in breach of coronavirus rules, were published.
Claiming Mr Hancock was the "ultimate decision-maker" in awarding the contract to Abingdon Health, Mr Barrett told the court that Mr Hancock had used multiple non-government emails for Government business. However, no searches had been conducted and no documents had been disclosed.
Philip Moser QC, for DHSC which is contesting the claim, argued Mr Hancock had a "limited" role in the contracts.
"There is no reasonable basis on which to seek such disclosure, because Mr Hancock's involvement in the matters which are in issue in these proceedings was limited and, in any event, any communications from the then Secretary of State would have been caught by the existing disclosure exercise," he said.
Mr Justice Fraser ordered that both Mr Hancock's Government and non-Government communications that were used for Government business should be searched for relevant material.
The judge said: "It seems to me that even though his involvement has been described as 'limited', 'limited' can still be quite significant."
He also ordered that ex-health minister Lord Bethell must provide a witness statement over the use of personal devices for Government business.
The Conservative peer left the Department of Health and Social Care (DHSC) last week following calls to resign over his use of a personal email account rather than official communication channels.
Mr Moser said in written arguments: "There is no evidence whatsoever in the documents relied upon by the claimants ... that Lord Bethell, or others, used personal communications devices to communicate substantively with Mr Hancock in relation to Abingdon."
However, he added that the former minister had agreed to provide a witness statement and to have his devices searched.
A spokesperson for the former health secretary said: "Mr Hancock had no involvement in the awarding of this contract, or indeed any other contracts. They were all awarded through formal processes, as the National Audit Office has confirmed.
"At the time, everyone in the Department of Health and Social Care was working every hour to respond to the pandemic and boost testing capacity. Any suggestion of wrongdoing is completely false."
The full trial is due to take place from December 6.