Enclosed as a part of the 1825 enclosure of Hatfield, Thorne, Sykehouse, Fishlake and Stainforth (Haywood 1825), 'Old Mill Field' has probably been enclosed from a former open field. Between this area and the village of Hatfield is a separate area of less regular enclosure, probably reflecting an earlier episode of piecemeal enclosure of the same field. No legibility of earlier field outlines - the boundary between 'Old Mill Field' and 'New Mill Field' was lost at the time of their parliamentary enclosure and is now formed by the late twentieth century M18. Centre of field pattern underlies the mid 20th century housing built along Old Mill Field Road.