Interrupted ditch system at Potash Farm

Freston causewayed enclosure stands on the Shotley peninsula in Suffolk, between the Orwell and Stour estuaries. It lies 31 metres above sea level on gently rolling farmland south of Ipswich. A modern road cuts through the site, and nearby farm buildings date from the 17th century. The enclosure covers 8.55 hectares, making it one of Britain’s largest of its kind. Two concentric ditch circuits once enclosed the area, now visible only as cropmarks. A long rectangular structure in the north-east corner may be a Neolithic longhouse or an Anglo-Saxon hall. The site was first spotted in 1969 by aerial archaeologist J. K. St Joseph. Radiocarbon dates show the inner ditch was dug between 3800 and 3500 BC, around 3700 BC. Excavations in 2019 recovered Neolithic pottery and oak charcoal from a vanished palisade. A spring in the centre may have made the spot attractive for both practical and ritual reasons. The ditches were over two metres deep and would have taken thousands of person-days to dig. English Heritage considers the possible longhouse of national importance. Visitors walk over ploughed fields where banks and ditches have long since vanished. Cropmarks trace the two ditch circuits and faint lines that may mark where a palisade once stood. The rectangular structure’s outline can be seen in the north-east corner. A spring-fed channel once crossed the site, perhaps creating natural gaps in the ditches. The flat landscape offers wide views across the Suffolk countryside. The enclosure’s scale and depth show the ambition of early Neolithic builders.