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South Norwood Country Park is a park, close to Elmers End station, mostly in the London Borough of Croydon. It is a 47 hectare green space which opened in 1989. The park occupies a mix of countryside and parkland, and land formerly used for sewage farms.
Wikipedia: Link

Route 21 of The National Cycle Network runs south from Greenwich out of London through Lewisham (the Waterlink Way) to Crawley, and then via East Grinstead and Eridge to Heathfield and Eastbourne, a distance of 95 miles.
The section between Groombridge and East Grinstead follows the Forest Way. Link
See Link for a map of the route.