John Lennon is an enthusiastic home renovator, a part-time engineer, a professional software designer and an all-around tinkerer. His home improvement projects range from a 17th-century French farmhouse through a chain of 'knackered English bungalows' to his current home in Truro, which he is now busily turning into a test bed for urban off-grid living. He has three grown-up children, a tolerant wife and even more tolerant neighbours.