Mark Evans meets Dwayne and Janet, who have a dream to design and build an experimental oversized houseboat, so they can take their home with them anywhere on the vast network of UK canals. Never having lived on the water before - nor even driven a boat - taking the plunge with building their own floating home from scratch is a huge challenge. Also, water-loving couple Lydia and Wout live on an old steamship and have decided it's time to modernise and join a small community of floating homes on a canal south of Amsterdam. Will they be able to get their spectacular home, with its wraparound deck, to its mooring?