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The Tandridge Border Path is a 52 mile walk following the boundary of Tandridge District with Kent, Sussex and Greater London, linking the villages and hamlets of East Surrey. Developed in 2000 to commemorate the Millennium. The route has a simple sign TQ3940 : Tandridge Border Path sign.
Link

The Vanguard Way is a long distance walk of around 66 miles from East Croydon in outer London to Newhaven on the South coast of England. It passes through the counties of Surrey, Kent and East Sussex, between Croydon and Newhaven, East Sussex. It connects the London suburbs to the south coast, via the Ashdown Forest and the Cuckmere valley. The walk was developed in celebration of the 15th anniversary in 1980 of the Vanguards Rambling Club, who named themselves after an occasion when they returned from a walk travelling in the guard's van of a crowded train.
See Link for more details on both Vanguard Way and The Vanguards.