![uk - How to use purchased train tickets for London Heathrow Underground to Norwich - Travel Stack Exchange uk - How to use purchased train tickets for London Heathrow Underground to Norwich - Travel Stack Exchange](https://i.stack.imgur.com/DkAGP.jpg)
uk - How to use purchased train tickets for London Heathrow Underground to Norwich - Travel Stack Exchange
National Rail on Twitter: "@LawrenceTanner1 Hi, I believe this ticket is not valid on the tube and can only be used on National Rail services. Tickets that can be used on the
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