Reverend G E C Knapp was an enthusiastic amateur archaeologist who led excavations at Selborne Priory from 1955 to 1969. He was Vicar of East Worldham from 1944 to 1964. He had a keen interest in medieval tiles in Hampshire, writing papers for the Hampshire Field Club and Archaeological Society, including "The Medieval Paving Tiles of the Alton Area of N E Hampshire", and articles for local newspapers on "Medieval Encaustic Paving Tiles in the Romsey Area" and his excavations at Selborne Priory.
Knapp corresponded with Elizabeth Eames on the subject of tiles in Canterbury. On his death, his widow Joan Knapp handed her late husband's collection to the Committee of the Census of Medieval Tiles in Britain.
(See also the collection of the Census of Medieval Tiles - reference code CMT.)