Report on a magnetometry survey, conducted to inform the proposed construction of a new business park on land at Gwash Valley, Stamford. The survey identified a number of linear and discrete magnetic anomalies across the site, which were thought to represent the remains of former ditches and pits of uncertain date. {1} Subsequent trial trenching in this area confirmed the presence of a number of linear features, with a particular concentration in the south-east corner of the site. The features were thought to represent the remains of former drainage ditches and possible flood defences, adjacent to the River Gwash. Small quantities of Roman pottery were recovered from the fills of several of the ditches, indicating a Romano-British date for this activity (see ELI7743).