Does Heathrow ever close?

Related questions

1. Do you really need to be at the airport 2 hours early?
2. Can I stay in Heathrow airport overnight?
3. Is Heathrow Terminal 1 being rebuilt?
4. Can I bring a guest to Air Canada lounge?
5. What to do if you have an overnight layover?
6. How long does it take to get a transit visa for Russia?
7. How many hours before can I enter airport?
8. How long before a flight can you check a bag?
9. Is it cheaper to buy Heathrow Express tickets online?
10. Where would a third runway go at Heathrow?

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14. #restrictions
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21. #restricted