I currently have a zone 1-3 Travelcard on my Oyster and need to add zones due to a house move this weekend. If I look online, there is information on the TfL site that it is possible, but when I click on the link it just takes me to my account where there are a number of options, but not one to add zones. I called the "24 hour helpline" and got a menu of options but nothing I needed, followed by a message that other departments are closed and nobody can help with a number of things including Oyster queries. I pressed * to hear the full opening times as instructed, but that just looped back to the start of the menu. Is it even possible to add zones to an Oyster Travelcard, or is it just something that is advertised but is impossible to do? I get the impression that if I do get through I will just be referred to the website where that option doesn't exist, in the hope I will just cancel my existing Travelcard and buy a new one, which is, of course, more expensive.