Idstone  Idstone is a hamlet in the civil parish of Ashbury in the Vale of White Horse. Idstone was part of Berkshire until the 1974 boundary changes transferred the Vale of White Horse to Oxfordshire. Idstone is about east of Swindon in neighbouring Wiltshire. The Three Barrows are bowl barrows on Idstone Down about south-east of the hamlet and about south-west of Ashdown House. Idstone's toponym has evolved from the Old English "Edwineston" in the 12th century through "Edyston" and "Edwiston" in the 15th century, "Edston" in the 16th century and "Idston, Hidston, Geston" or "Jeston" in the 17th century. The form "Edwinston" seems to have been in use until the 19th or 20th century. In the 12th century the manor of Edwineston was assessed at three hides and the Benedictine Abbot of Glastonbury was the feudal overlord. The Trip the Daisey Inn was built late in the 17th century. It is now a private house.