Dominic Cummings tried to fast track a £530,000 grant to an external data team – bypassing normal Whitehall procedures, leaked emails suggest.
Boris Johnson's former top adviser urged civil servants to issue the payment with 'no procurement, no lawyers, no meetings, no delay', according to the messages.
The Government department involved – the Department for Health and Social Care (DHSC) – insisted that due diligence had been followed in issuing the grant.
But Labour said it was another example of the Government's 'disdain' for the rules governing the use of taxpayers' money under Mr Johnson's leadership.
Earlier this month a High Court judge ruled a decision to award a contract to a firm whose bosses were friends of Cummings was unlawful.