Watching brief by K Johnson of CA revealed alluvial silt sealing successive layers of demolition material associated with the dismantling of the abbey. No in-situ structural remains were encountered in an investigation that by design did not proceed through the complete sequence of deposits in some areas. However, a number of noteworthy finds were recorded, including twelve inlaid medieval tiles from the nationally significant Chertsey tilery, and a coin of 1603, which suggests that the demolition process on the site continued for some time following the Dissolution. (408)