I need to travel to Enfield Lock (Zone 6) from Vauxhall (Zone 2). The weekly travelcard would cost me £36.40. However I've been told that, because my journey (on the Victoria line) going past stations in Zone 1, I would also need to pay for this - which would cost me around £53 a week. This is an extra £680 a year. But why am I required to pay for this if I don't intend to get off at any of the stations in Zone 1? Why cant I just pay for a 2-6 travel card?