Cambridge Archaeological Unit undertook an open area excavation at Knobbs Farm, Somersham. The excavation identified several phases of archaeology including a small number of widely dispersed Neolithic and Bronze Age pits and a more substantial Early to Middle Iron Age phase consisting of a ring gully, several clusters of pits and postholes, three four-post structures and more unusually for the period a number of probable boundary ditches. Also identified was the western extremity of the Late Iron Age and Roman activity seen in previous phases of work. This included field boundary ditches, midden pits, graves, a trackway and structures, including a possible granary.