What is the best way to pay for travel in London?

Related questions

1. Can you take the tube from Heathrow to Paddington?
2. Can I use Oyster Card from Heathrow to Paddington?
3. Is the Heathrow Express free?
4. Does Oyster card cover Heathrow Express?
5. Can you use Oyster card on Crossrail?
6. What is the cost of the Heathrow Express?
7. What does TfL rail mean?
8. Will Crossrail go to Heathrow?
9. How do I get from London to Heathrow by train?
10. How do I get from Heathrow to Paddington Station?

Tags

1. #emirates
2. #easiest
3. #overground
4. #national
5. #river
6. #services
7. #cable
8. #travel
9. #trips
10. #paying
11. #london