A watching brief was maintained by M Dover of SCAU, for Thames Water Utilities, on the construction of a replacement water main. A concentration of prehistoric pottery was noted at TQ 037 440 and further excavation revealed a layer containing numerous sherds of Late Bronze Age or Early Iron Age pottery overlying what appeared to be a buried soil, which itself sealed a row of possible post holes. It seems likely that the layer containing the prehistoric pottery represents erosion of material from the adjoining hillslopes.