To the #1 grandad

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