Excavation and watching brief by J Robertson of SCAU, for Reigate and Banstead Borough Council, revealed the bailey ditch of Reigate Castle, and related 13th century features. The ditch had been cleaned out in the 18th century and used as a moated feature within the landscaped grounds of the former castle, and filled in during the late 18th or 19th century, possibly when the adjacent Tunnel Road was constructed in 1821.