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A friend sent me a photo of this map of Bermondsey showing St James's Church surrounded by fields in the days before the railway criss-crossed the parish - and that is the clue to the date of the map.
The railway came in 1836. The church was built in 1829. So the map shows Bermondsey sometime between 1829-1836, a country village on the banks of the river, dominated by a pristine new church.
Just a few years later and in the picture below, the church peeps out from behind the railway viaduct, but the foreground still suggests a predominantly rural scene.