Emergency repairs to a broken sewer during July 1980 entailed the excavation by Canterbury City Council of a trench down the centre of the High Street St Gregory's. Permission was granted for a watching brief to be undertaken during the excavation of the trench. Although shuttering obscured the sections along much of the trench, two flint and mortar walls were observed and recorded.

Both walls survived to a depth of 1m and were aligned approximately at right angles to the High Street. Wall 1 was c. 3m in width, whilst Wall 2 was c. 1.8m in width. The tops of the walls was c. 1.2m below the existing street surface. No floor levels were located in the trench, which negative evidence seemed to indicate that these floor levels had been truncated by later activity within the trench.

As these walls were close to the assumed position of the Priory Church of St Gregory, it was suggested that they belonged to either the Church or other buildings of the Priory complex

Bennett, P., MacPherson-Grant, N. & Blockley, P., 1981, Four Minor Sites Excavated by the Canterbury Archaeological Trust, 1978-1979 (Serial). SKE30471.