Wessex Archaeology was commissioned by Taylor Wimpey (Oxfordshire) to undertake a detailed gradiometer survey at Harwell, near Didcot, Oxfordshire centred on NGR 448990,189630. The aim of the work was to establish the presence, or otherwise, and nature of detectable archaeological features on the site. The site is located on the northwest edge of Harwell, Oxfordshire. Harwell is found approximately 3.4km west of the centre of Didcot and 16km south of Oxford. The site comprises three arable fields with the survey extents defined by hedgerows and trees on the south, east and north and by the site limits on the west side. Detailed gradiometer survey was undertaken over all accessible parts of the site, a total of c.7.4ha, and has demonstrated the presence of anomalies of possible archaeological interest within the survey area, along with anomalies of increased magnetic response. The anomalies of archaeological interest include several oval shaped and curvilinear positive anomalies interpreted as ditch and pit-type features, including at least three linear alignments which may represent former field boundaries. Evidence of ridge and furrow agriculture has been identified and several further linear alignments. The proximity to known archaeological features to the south of the Site suggests that some features may be of archaeological significance. The geophysical survey was undertaken between the 13th and 14th January 2015.