Mains electricity
Mains electricity was introduced to Ambrosden in 1935. The Bicester Military Railway between Bicester and Piddington was built through Ambrosden in 1941 and remains in use to this day. In 1951–52 the Ministry of Defence and the Central Ordnance Depot had a new housing estate of some 200 houses built in the village. The Government bought a significant area of land from most of the farms in the parish. There are three types of house, all designed by the architect R. Potter of Salisbury, all built of brick and roofed with tiles, and many sited around a green.