Aberlash House, Sonning Eye, Oxfordshire
A Grade II-listed, 17th-century house on the largest private island in the Thames. 10 beds, 8 baths, dressing room, 4 receps, library, pool, 2-bed annexe, greenhouse, cottage, wet boat house, moorings, 5.5 acres. £10m Sotheby’s International Realty 01491-693297.