Callum's birthday

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Across
  1. 3. The capital of Somalia
  2. 5. Callum's occupation before the AAT
  3. 6. Weekend Callum locked himself in
  4. 8. The toughest cop in the 99
  5. 11. Callum's favourite Arnott's biscuit
  6. 12. Callum's favourite past-time
  7. 15. Field of study
  8. 16. Horse of Caligula
  9. 18. Catalyst of WW1
  10. 20. A common allergy
  11. 21. Czech saying: when the cat is away the mice will _____
Down
  1. 1. Place Callum worked before the AAT
  2. 2. Number of claps in the Friends theme song
  3. 4. Callum's favourite ANZSCO occupation
  4. 7. A shade of purple-pink
  5. 9. An activity completed by Callum on Valentine's Day
  6. 10. An oft-repeated phrase by Callum (Thanks ___)
  7. 13. Hogwarts house known for its ambition and cunning
  8. 14. Ancient Tribunal tool (known as a pig stabber)
  9. 15. Birthday boy's last name
  10. 17. Meaning of Batool's last name (also the name of a Simpson's character)
  11. 19. Celebratory food