Extensive excavations on the fen margin at Billingborough revealed archaeological remains of considerable regional importance. A Middle Bronze Age enclosure is one of the most extensively excavated enclosures of its type in East Anglia. Late Bronze Age/Early Iron Age salt-making debris represents one of the earliest and most substantial assemblages of such material in the area. The results have led to the creation of a pottery sequence for the Bronze Age and Iron Age periods in the region.