I want to purchase one day paper travel cards in London to take advantage of the 2-for-1 admission to the Tower of London. Is it possible to buy them early (the day before) with a travel date for the actual day we will use them or must they be purchased the same day they are used? I am trying to plan my agenda for the day to get to the Tower first thing in the morning, and if I don't have to detour to a train station before starting out, that would help time-wise. Thanks!
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