Britain's Most Expensive Houses

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.

In Oxfordshire, Guy hopes to bring a £6.5m, 14-bedroom, five-acre mega manor house onto his books; Portsmouth beckons John to an unusual seaside property; Kenrick heads to Camden to try and secure the listing of an uber-modern apartment.

John has a vast family home to sell in the New Forest; Guy and Aoife work on one of their smallest properties: an industrial-style one-bedroom pied-à-terre in Pimlico; James visits a new development of 55 apartments brimming with musical history.

Diana vies for the listing of a £30m Mayfair mega home; Christine enlists the help of fellow brokers Tessa and Amy to help close a lucrative deal for a Georgian Grade I listed townhouse in Bath and a modern country home just outside Henley.

In Surrey, Amy's on the hunt for a buyer for a stunning 1930s architectural home, boasting a professional recording studio that's hosted the likes of Pink Floyd and Paul Weller; Natalie looks to sell an enormous, converted factory in London.