 The original castle bridge was constructed from wood but this was rebuilt with stone facades and piers in the late medieval period, and then subsequently replaced with an earth bank, further improved in the early 19th century; the current timber bridge dates from the 1960s.A gate house originally protected the entrance, with an arched passageway made from Roman brick, flanked by guardrooms; only the foundations now survive.In the north-west corner of the bailey are the foundations of the great kitchen.