How much is the tube from Heathrow to central London?

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6. Where do I buy an Oyster card at Heathrow?
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Tags

1. #travel
2. #station
3. #giving
4. #heathrow
5. #visit
6. #single
7. #travelcard
8. #fares
9. #information
10. #costs
11. #underground
12. #london
13. #payments
14. #centre
15. #unlimited
16. #terminals
17. #zones
18. #anytime
19. #central