In August 2012 Oxford Archaeology (OA) carried out a field evaluation on land at Dunsfold park, Dunsfold, Surrey on behalf of Bio Group Ltd. The evaluation comprised machine excavation of 8 trenches 60m long and 2 trenches 25m in length, all with a width of 1.6m. The evaluation found very little in the way of significant archaeological remains. Agricultural furrows were identified crossing the site, generally from west-north-west to east-south-east, but the only archaeological features were one pit (or tree-throw hole) and a north-south ditch that was located crossing two trenches. The pit produced a small assemblage of medieval pottery dating to the later 13th or 14th centuries. Two phases of furrows were probably present, and it is possible that the earlier of these was dated to the 12th-14th century, but it is equally likely that the medieval finds were residual in the furrows. The ditch was undated. Prehistoric flintwork was also discovered in very small amounts, supporting previous evidence for a limited prehistoric presence in the area.