May 2004 and September 2006. Oxford Archaeology carried out two field evaluations to the west of the A1 Gonerby Moor roundabout, Grantham. The 2004 field evaluation was carried out in two phases; a geophysical survey and a phase of targeted trial trenching. The geophysical survey revealed a large anomaly that may represent a former course of the Foston Beck, which now lies to the east of the survey area, and several ditched enclosures. The trial trenches were located only within the impact area and targeted using the results of the geophysics. The trenches identified an undated series of postholes and a ditch next to the Foston Beck watercourse. The 2006 evaluation consisted of further trial trenches within the site, which were also targeted to test the results of the geophysics. This phase of the evaluation revealed an area of Prehistoric activity to the north-west of the site