Evaluation by A Haslam of PCA following demolition of the former aerospace works revealed archaeological features in the form of parallel ditches and several small pits. The fills of all the features were largely sterile, with only one pit producing pottery and pantile fragments from the late 18th to early 19th centuries. The lack of earlier, residual, material suggests that none of the features is likely to pre-date the late post-medieval period. The ditches most probably represent agricultural features in the form of field divisions or boundary plots, similar to but generally on a different orientation to those shown on the Sunbury preliminary Enclosure map of 1800