Heard of London? Have you heard of these?

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Across
  1. 2. Name of the square in the middle of London
  2. 4. Largest sporting event in 2012
  3. 5. Building with treasures from all over the world (7,6)
  4. 9. Visit this shop, there's nothing you can't buy
  5. 10. Fly here for a bird's eye view of London (6,3)
  6. 12. London is the capital of this country (5,7)
  7. 14. A London football club
  8. 15. Common name for the London Underground
  9. 16. Most famous bell in the city, it also tells the time (3,3)
Down
  1. 1. The seat of government
  2. 3. Large bright red form of transport (6,6,3)
  3. 6. River which runs through London
  4. 7. Bridge the newest bridge over The Thames,opened in the year 2000
  5. 8. Busiest shopping street
  6. 9. Busiest airport in the world
  7. 11. Tennis is played on grass
  8. 13. London taxi (5,3)