In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Bourton like this:
BOURTON, a chapelry in Gillingham parish, Dorset; on the verge of the county, 2½ miles SW of Mere, and 3 NNW of Gillingham r. station. It has a post office under Bath. Acres, 828. Real property, with Silton, £5,415. Pop., 921. Houses, 210. The property is much subdivided. The living is a p. curacy in the diocese of Salisbury. Value, £90. Patrons, Trustees. The church is good.
GB Historical GIS / University of Portsmouth, History of Bourton in North Dorset | Map and description, A Vision of Britain through Time.
Date accessed: 27th April 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time , and maybe some references to other places called " Bourton ".