A watching brief by D W Williams of SyAS on works to underpin a toilet block recorded part of a substantial structure constructed of chalk blocks with brick facings; the floor of the structure was of clay with parallel timbers at short distances apart. The structure had been infilled with brick rubble and silty clay. No dating evidence was recovered but the structure is probably early 19th century in date and presumably relates to water management in the landscaped gardens around the Priory. (302)