This programme features a grade I listed terraced home for sale overlooking Regents Park Lake. Built in 1822 and designed by renowned Regency architect John Nash, it's worth an eye-watering £29million, making it one of the most expensive homes in the UK. Also in London, managing director of UK Sotheby's International Realty Guy is invited to sell a rather unusual houseboat boasting five bedrooms and three bathrooms.