In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Bishopsgate like this:
BISHOPSGATE, a hamlet on the N border of Surrey; adjacent to the Great Park of Windsor, near Virginia water. It lies amid charming scenery; and was the place where the poet Shelley wrote his "Alaster."
Additional information about this locality is available for Egham
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Bishopsgate has changed, please see our redistricted information for the modern district of Runnymede. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Bishopsgate and units named after it.
GB Historical GIS / University of Portsmouth, History of Bishopsgate, in Runnymede and Surrey | Map and description, A Vision of Britain through Time.
Date accessed: 25th May 2016
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Bishopsgate".