The Travelcard map, showing the zone in which each station falls, is set out as part of the Travelcard Agreement between the Train Operating Companies and Transport for London (TfL). Any changes to station zones must be proposed by a signatory to the Agreement and then agreed by the remaining signatories. The government is not a signatory to the Agreement and therefore has no role in proposing such changes to station zones.
Once a change is proposed by TfL and the Train Operating Companies, the Department for Transport can approve or reject the change proposals. This decision is made by the Secretary of State for Transport, on the basis of a business case and other wider policy and initiatives that may be considered at the time. If the proposal does not represent good value for money, it would be unlikely to get approval. It would be inappropriate for the Government to promote or back any proposals outside of this established process.
In the current rail franchising contracts there are commitments for train operators to bring forward proposals to extend Oyster and Contactless to Swanley, Epsom, Hertford North, Luton Airport Parkway and Welwyn Garden City. The Secretary of State will consider these proposals on their individual merits when they have been developed and submitted in accordance with the process set out above.