When Charles III became king in 2022, he didn't just inherit the crown, he was also handed the keys to a multibillion-pound property portfolio. From spectacular castles and palaces to expansive manors and rambling farmhouses, he now has more residences than any other modern British monarch. This programme assesses worth of these royal homes around the nation and what is going to happen to these properties next as King Charles forges a fascinating legacy.

Bagshot Park is the Royal Family's most secretive royal residence, and the home of their most powerful secret weapons: Prince Edward and his wife Sophie. Since its humble beginnings as a royal hunting lodge, it has always been at the centre of royal life. It's witnessed some of the biggest royal blunders, become a much-loved place for the Duke and Duchess of Edinburgh to raise their family, and - with 120 rooms of extraordinary interiors - wowed anyone lucky enough to step inside. This unbelievable property has protected royal family secrets for generations, until now. 

In the heart of the Cotswolds is Gatcombe Park, Princess Anne's private residence. A sprawling 1,263-acre estate hidden away deep in the Gloucestershire countryside, this is the one place Princess Anne can truly be herself. She transformed this damp and run down manor house into a beloved nine-bedroom family home, making it a cherished sanctuary not just for herself but for her children Zara and Peter too. But although this estate's proved to be a happy home for humans and horses alike, only a privileged few have ever been invited to visit... Until now.