Can I move between terminals at Heathrow?

Related questions

1. Why do they ask for your boarding pass in duty free?
2. Does the Heathrow Express go to Terminal 5?
3. How long before a flight should you arrive?
4. How long does it take to get through arrivals at Heathrow?
5. How much time do I need at Heathrow Airport?
6. Is there a pick up point at Heathrow Terminal 5?
7. What do you do when you check in online at the airport?
8. How many planes take off every minute at Heathrow?
9. Can I print my boarding pass at home?
10. How far is America from England by plane?

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18. #between