Filchampstead  Filchampstead is a hamlet within Cumnor Parish, Oxfordshire. Until the 1974 boundary changes it was in Berkshire. It lies on the Cumnor Road (B4017) between Farmoor and Cumnor village, at the foot of a hill known locally as 'Tumbledown Dick'. Filchampstead lies alongside Farmoor Reservoir and the Oxford Green Belt Way public footpath.