During June and July 2006, an archaeological watching brief was undertaken at Keepers Cottage on the Gorhambury Estate in St Albans, Hertfordshire, during the installation of a new sewage plant. No pre modern artefacts were recovered from the site, and no definite features were observed. However, deposits of pebbly clay observed within the groundworks could potentially represent the course of an Iron Age dyke associated with the Scheduled Ancient Monument (SAM) of Prae Wood, located directly to the west of the site.