Birthday Puzzle!

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Across
  1. 1. Fruit/vegetable (8)
  2. 3. Nik name (10)
  3. 8. Pitched percussion instrument (9)
  4. 14. Creative object or output (3)
  5. 18. Lung disease (45)
  6. 24. Progressive rock band favoured by William and Karl (4)
  7. 25. Locally made chutney (4,4)
  8. 26. Monday night activity (9)
  9. 28. Sweetener (7)
  10. 29. Sale of consumer goods (6)
  11. 31. Approach to land management and system design (12)
  12. 35. Evil former Prime Minister (7,6)
  13. 37. Cleansing herb (5,4)
  14. 39. Karl thinks they're funny (5)
  15. 40. Part of a house (5)
  16. 44. Another legendary cat (3)
  17. 45. Road of dual habitation (4,6)
  18. 46. Clawingest cat (5)
  19. 47. William's favourite food (7)
  20. 48. Community of alternative educators (10)
Down
  1. 2. Delicious cut of meat (4,5)
  2. 3. Nik Name (11)
  3. 4. If these are thumbs, then these should be... (8)
  4. 5. Bean variety (4,11)
  5. 6. William's favourite subject (9)
  6. 7. Awesomest car (6)
  7. 9. Brand of Android phone (4)
  8. 10. Nik Name (4,1)
  9. 11. Passageway (8)
  10. 12. Legendary chili sauce (4,3)
  11. 13. Hebrew prophet; also the first name of an Hobbit actor (6)
  12. 15. Destroy in the most extreme manner (inf.)(4)
  13. 16. Zucchini (9)
  14. 17. Supreme Being (3)
  15. 19. Best month (7)
  16. 20. Awesomest pussycat (4)
  17. 21. Higher in rank (6)
  18. 22. Superior education method (11)
  19. 23. In the style of a bygone era (3,6)
  20. 27. First sheep (8)
  21. 30. Proper bogan transportation (6)
  22. 32. Nicole's other favourite colour (4)
  23. 33. Occupation of the boat people (8)
  24. 34. Hot air balloons (inf.) (7)
  25. 36. Nicole's favourite colour (5)
  26. 38. begin (2)
  27. 41. Common garden herb (5)
  28. 42. Unmarried partner of a sibling carrying an unborn child (8)
  29. 43. Greek alphabet character; also a sheep (5)