Buying boundary zone tickets from London Underground ticket machines
If you are a Travelcard (or Freedom Pass) holder, you are allowed to use a combination of it and an extension ticket to make a through journey across the zonal boundary, and the train is not required to call at the boundary station. This article shows a demonstration to buy an extension ticket, called boundary fare, on London Underground machines. Some other ticket machines sell them, including those operated by c2c, London Overground and Scheidt & Bachmann (S&B) ticket machines…