This does mean those travelling between London and outside London are disadvantaged compared with those travelling to one of these six stations and another station outside London because the latter can add bus travel at each end but the former can only include bus travel at one end.
e.g. Commuter who travels between Elstree and Borehamwood and Bedford can buy plus bus for both ends of the journey but a person travelling from Elstree and Borehamwood to West Hampstead can either buy a Travelcard to include buses at the West Hampstead end or buy point to point and Plusbus for Elstree & Boreamwood.
