Sandys remained in Suffolk, in Bury St Edmunds, where he built up his practice, designing Finborough Hall, Suffolk (1795), the entrance-lodges at Chippenham Park, Cambs. (c.1800), the Assembly Rooms (now Athenaeum), Bury St Edmunds (1804), the County Gaol, Worcester (1809–13—demolished), Dorchester Bridge, Oxon. (1813–15), and the County Courts and Gaol, Durham (begun 1809 and completed by George Moneypenny and Ignatius Bonomi in 1811 after Sandys was dismissed following his loss of a legal action by the Durham Magistrates). This event seems to have ended his career by 1814.
"Sandys, Francis." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (October 17, 2018). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/sandys-francis
"Sandys, Francis." A Dictionary of Architecture and Landscape Architecture. . Retrieved October 17, 2018 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/sandys-francis