Watching brief of geotechnical works by A Turner of PCA revealed substantial ground disturbance probably caused by gravel extraction in the 1970s. Eight pits contained demolition rubble, some of which might have originated from Hyde House, a 17th century house that formerly occupied part of the site, although it is more likely that it represents material dumped in areas of gravel extraction. Three pits displayed deep deposits of natural brickearth, although their depth and the friable nature of the underlying gravel suggest that they too were redeposited after extraction. One pit, in the centre of the trial area, contained a sequence of deposits that might be expected from an undisturbed area of Kempton Park Gravel, but no features of archaeological interest.