Can you walk between terminals at Heathrow?

Related questions

1. Does BA fly from Terminal 3 Heathrow?
2. What terminal is British Airways in Heathrow?
3. Why is London Airport called Heathrow?
4. Which Heathrow Terminal for British Airways arrivals?
5. Does Heathrow close overnight?
6. Why is Heathrow called Heathrow?
7. Which Heathrow Terminal is the best?
8. How much did Heathrow Terminal 5 cost?
9. What terminal do Delta flights arrive at Heathrow?
10. Which is the main terminal at Heathrow?

Tags

1. #oyster
2. #heathrow
3. #between
4. #central
5. #london
6. #terminal
7. #travelling
8. #terminals
9. #transport
10. #payment
11. #which
12. #charged
13. #shuttle
14. #trains
15. #contactless
16. #there
17. #station