Headland Archaeology (UK) Ltd undertook a geophysical (magnetometer) survey of land off Prospect Road, Castlethorpe, Milton Keynes. The survey has identified a localised complex of fragmented linear and curvilinear anomalies (soil-filled ditches) at the southern end of the site which are assessed as of likely archaeological origin, probably forming patterns of enclosure and land division. Parallel rectilinear anomalies along the south-western site boundary may be due to a double ditch extending west beyond the survey limit. However this interpretation is tentative and part of the anomalies may be due to the ridge and furrow cultivation which is present throughout this part of the site. No anomalies of definite archaeological origin have been identified within the north of the site and none within Castlethorpe Castle Scheduled Monument, part of which extends into the northern tip of the site.