The location is where the name Southgate appears on the modern 1:25,000 map.
Information about this locality is available for Crawley
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 Southgate has changed, please see our redistricted information for the modern district of Crawley. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Southgate and units named after it.
GB Historical GIS / University of Portsmouth, History of Southgate, in Crawley and Sussex | Map and description, A Vision of Britain through Time.
Date accessed: 08th December 2013
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Southgate".