A topographic survey by R Hooker and J Newell for the Prehistoric Group of SyAS recorded an earthwork formed of a broad shallow ditch, to the south of a wide low bank. The bank had a series of protuberances on its north side. Towards the east they were regularly spaced at about 8–10m intervals. The feature presently measures c 450m in length but was probably truncated at its eastern end, without recording, by the construction of the M25. (Bulletin 446)