A geophysical survey, comprising detailed magnetometry, was carried out by Archaeological Surveys Ltd along a new section of a water main route near Coleshill in Oxfordshire. The survey was requested as an addition to three areas previously surveyed during the initial scoping for the location of a new water main between Faringdon and Blunsdon. The original survey located evidence for prehistoric settlement laid out as two linear groups within a single field to the south of Gorse Hill on the Buscot estate. The results of the current survey indicate a continuation of the prehistoric settlement southwards for another 100m. The features include a number of ring ditches, relating to probable Iron Age round houses, as well as a number of small square enclosures and conjoined sub-circular enclosures. A number of discrete positive responses have also been located, which could relate to pits or areas of burning along with a group that appear to form a circle and could relate to former post-holes. A fragmented linear anomaly may form a south western boundary to the features, but no clear boundary feature can be seen in the south east or east.