Can I buy Stansted Express tickets on the train?

Related questions

1. Does priority boarding include seats Ryanair?
2. How early should you get to the airport Stansted?
3. How far is Stansted train station from the airport?
4. Does London Stansted airport close at night?
5. Can I use contactless to Stansted Airport?
6. Can I sleep in Stansted Airport?
7. How do I get from London to Stansted Airport?
8. Can I take a rucksack on a Ryanair flight?
9. How much does it cost to get to Stansted Airport?
10. How do I get from Stansted Airport to Cambridge?

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