A watching brief by R Poulton, P Jones, N Marples and M Dover of SCAU for C A Cornish & Assocs, was carried out during groundworks for redevelopment. The site lies immediately south of the Thames and fluvial deposits were identified across most of the site. Some pieces of axe-trimmed wood were recovered from the lower deposits; no dating material was recovered, but these pieces are thought likely to be prehistoric in date. Observations on works to The Causeway, which lies immediately south of the site, indicated that little, if any, of the original make up survived in this section.