All towns included have a direct rail service to London with a travel time of one hour or less. We took the top 100 cities by population from World Gazetteer’s 2012 study and added the following seven towns that are widely considered part of the commuter belt: Baldock, Basingstoke, Berkhamsted, Burgess Hill, Haywards Heath, Sittingbourne and Ware. We removed towns that don’t have a direct rail service into London or are more than one hour away on the train. The total cost of each commute was worked out by adding the costs of the most affordable rail season ticket and car park season ticket from/at that station.