What do you already know?

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Across
  1. 1. Symbol of Northern Ireland
  2. 3. Sea on the north of England
  3. 7. Capital city of Wales
  4. 8. Symbol of Wales
  5. 10. Capital city of England
  6. 11. The Queen's place of residence
  7. 12. Symbol of Scotland
Down
  1. 2. English King's mother
  2. 4. Capital city of Scotland
  3. 5. British flag
  4. 6. Capital city of Northern Ireland
  5. 7. Sea between France and the UK
  6. 9. Symbol of England