Time Team camp for three days next to the oldest bridge on the River Thames. Previous surveys have convinced local archaeologists that an early Norman castle existed here, with connections to Queen Matilda and The Anarchy. But there are also tantalizing links to the much later English Civil War. Almost immediately, pottery sherds and walls are revealed, with plenty of Roman fragments suggesting a Roman settlement. In all likelihood the Anglo-Saxons lived here too. The team test out a medieval trebuchet. They are joined by John Blair of Oxford University, geophysicist Roger Ainslie, and castles expert Richard K. Morriss.