Sydenhurst, Chiddingfold, Godalming, Surrey. A modern Palladian-style mansion in over 30 acres of grounds. It has ground-source heat pumps, super insulation and low-energy LED lighting. 9 beds, 9 baths, 3 receps, study, library, double indoor bowling alley, home cinema, indoor pool, spa, two cottages, lake, pavilion. £30m Knight Frank 020-7861 1065.
Huckworthy Mill, Sampford Spiney, Devon. A Grade II-listed former mill house connected to a former water mill, with its own hydro-electric generator. It has exposed beams and stonework, and a wood-burning stove. 4 beds, 3 baths, 3 receps, outbuildings, gardens, river frontage, 5 acres. £950,000 Mansbridge Balment 01822-855055.
Holmbury, Trinity, Jersey. A renovated granite farmhouse and attached one-bedroom cottage surrounded by landscaped gardens and ten acres of equine grazing. Its solar panels, air-source heating and computer-controlled hot-water services ensure…