To the #1 grandad

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Across
  1. 4. what came first?chicken or the egg?
  2. 5. awful
  3. 7. a combo with tonic
  4. 9. Asian country, independent from 1981
  5. 11. hand wear
  6. 12. disgusting material
  7. 14. #1 scottish oats
  8. 15. symbolises marriage
  9. 17. profession with hair
  10. 18. 3 strikes in bowling
  11. 20. sport favoured by Prince Charles
  12. 21. "scrumptiously light and fluffy"
  13. 23. painkiller
  14. 25. footwear
  15. 28. type of nut
  16. 30. killer whale
  17. 31. white sauce
Down
  1. 1. 4 person twin
  2. 2. prickly creature
  3. 3. male horse under the age of four
  4. 6. Queen's surname
  5. 8. 50%
  6. 10. Mexican hat
  7. 11. prestigious sport
  8. 13. sweet Bees
  9. 16. prickly plant
  10. 19. formed in 1988 English rock
  11. 22. type of wheat
  12. 24. Duke of Edinburgh
  13. 26. beer serving
  14. 27. common tree
  15. 29. rubber clogs/sandals