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The Sussex Border Path is a footpath route nearly 150 miles long around the inland boundary of the county of Sussex. The county owes its origins to the kingdom of the South Saxons and can claim to have one of the longest inland county boundaries from Emsworth to Rye. The route was devised in 1983 and is well signed along most of the route. Website Link
Map: 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.