Milton Keynes: The Round House

GP Peter Berkin and his wife Chard, an alternative medicine practitioner, have decided to build a new home at the bottom of their garden, but cannot agree on any part of the design - even the basic shape. Peter is a keen hobbyist who wants the house to feature a workshop where he can build a plane, and he's planning to spend twice the £200,000 budget Chard has in mind. Kevin McCloud follows their progress.