A watching brief by SCAU, for Reigate & Banstead Borough Council, on the excavation of geotechnical test pits on the site of a proposed extension found one showing possible archaeological stratigraphy. A subsequent watching brief by D W Williams on the excavation of further test pits recorded what may be the line of the castle moat. A wide and shallow ditch is suggested, the silt of which contained 13th century pottery. To the east of this, traces of a 13th century plough soil were recorded. (321)