Two people have been arrested on suspicion of committing fraud at a charity founded by Prince Charles.
The charity initially made a complaint to police after its auditors Kingston Smith noticed a discrepancy in its accounts.
A spokesman for the police said: "Officers from the Metropolitan Police's Economic and Specialist Crime Command arrested two people on 26 April on suspicion of fraud and money-laundering at an address in north-west London.
"A 49-year-old man and a 54-year-old woman were arrested and taken to a north London police station. They have been bailed to return at a date in June."
The charity's accounts are 178 days overdue with the Charity Commission. The charity has blamed this delay on staff and structural changes.
The charity said it had been asked by the police to make no comment.