After London; or, Wild England. By Richard Jefferies; 1911; Duckworth, London. Tales of London's post-apocalyptic fiction Part 1. (Twentieth Century Fiction; British Authors Digital Collection)

A story based on post-apocalyptic fiction of how London changes into a marshland following mysterious a natural disaster.
Features two parts:
“The Relapse into Barbarism” (the end of civilisation)
“Wild England” (adventures of male explorer Felix Aquila)
This is the first part of the kindle version.