Esher, Hersham and Walton-on-Thames are close to many popular attractions and Britain's largest airport. As the areas are classed as being outside of the Zones, fares are expensive and fines frequent. By classing Esher, Hersham and Walton-on-Thames as Zone 6 it would help to decrease policing and fining of unsuspecting passengers/tourists and could potentially increase the number of people using the extended network.
As the population of London increases, so must the Zone areas. Please include Esher, Hersham and Walton-on-Thames in Zone 6. There are many stations not classed as 'London' included in the Zones so there is no reason why these 3 stations should be left out.