A watching brief was held during the construction of a rear extension in the back yard of No 42 St John's Street. Building work revealed a section of the town wall and excavation of two trenches led to the discovery of quantities of medieval and post-medieval pottery. One trench sited by the rear door was dug to a depth of 2.0 m below ground level revealing black topsoil which "was presumably the north edge of the town ditch". A lens of burnt clay or daub was noted at 1.2m depth.<1>