Britain's Most Expensive Houses

An insight into one of the world's largest luxury estate agencies, UK Sotheby's International Realty. The brokers view a mega mansion set in 40 acres for a millionaire client.

Broker Lee actively searches for a buyer for the £17.5 million Huxley House on Billionaire's Row; Polina works to cater to a fashionista's requirements, which include ample shoe storage space and a dedicated cigar terrace.

John takes on Jelleys Hollow, a stunning property in the Surrey hills featured in "Beauty and the Beast" and "Star Wars;" Shereen sets her sights high in London, marketing a £12 million penthouse on the Thames.

John markets a £3.6 million Arts and Crafts-style seaside mansion on the south coast; Polina lists a new £4.5 million central London penthouse; Guy views a $40 million beachside property in Barbados.

The brokers at UK Sotheby's International Realty return, hoping to secure more multimillion-pound sales; Lee looks to sell an incredible grade I listed terraced home overlooking Regents Park lake; Guy tries to sell a rather unusual houseboat.

Constance is on a mission to get the listing for celebrity singer Laura Comfort's home; Guy values a quaint Tudor cottage in Henley-on-Thames; Diana takes on a high-end London rental.