Andrew Mountbatten-Windsor has been warned not to use the King's private money to fund his legal action against Thames Valley Police.
The former Duke of York is launching a bid to quash search warrants which led to his arrest, with a private High Court hearing due to take place on Thursday.
Stipend from the King
Andrew receives an annual stipend – the amount of which has not been disclosed – provided by Charles from his private funds, but a Palace source said it has been made clear that these monies should not be used to fund the judicial review.
The source added Andrew's legal defence was a matter for him and his lawyers, and that Buckingham Palace has no role in determining its strategy or actions.
Arrest and legal challenge
The late Queen's second son was arrested on his 66th birthday earlier this year on suspicion of misconduct in public office following allegations he shared sensitive information with Jeffrey Epstein during his time as the UK's trade envoy.
The Telegraph previously reported that Andrew has been granted permission to challenge whether Thames Valley Police acted lawfully over the searches relating to his arrest in February.
A judge at the Old Bailey issued warrants which allowed police to raid Andrew's residence on the Sandringham estate and his former Windsor home, Royal Lodge.
High Court hearing
On Monday, a judicial spokesperson confirmed a hearing in Andrew's legal claim is due to take place at 2pm on Thursday at the High Court, before Mr Justice Hilliard.
