The claims suggest the royal family has broken government rules by renting out properties with poor energy efficiency ratings, as well as earning seven-figure sums through controversial, multi-year deals with public services. The previously unreported figures have been unearthed as part of a five-month joint investigation between The Times and Channel 4's Dispatches, which is set to air on Saturday.
The Dispatches programme entitled 'secret millions' examines the cost to the nation of the Duchy of Cornwall and the Duchy of Lancaster.Read more: King axes disgraced Duke's security team as pressure mounts on Prince Andrew to leave Royal Lodge mansionRead more: King Charles 'finally cuts Prince Andrew off' as he 'axes Duke's annual £1m allowance'Both duchies royal institutions made up of land and dwellings that date back to medieval times.