Tim's 40th Birthday

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Across
  1. 3. One's young bloke is a star they say (3)
  2. 4. Arty gets revised plan. (8)
  3. 7. Discussion held while we had tea in bed. (6)
  4. 9. Studying - at this university? (7)
  5. 12. Radio fan awfully silent before hesitation. (8)
  6. 14. Almost bound to take dip in river for special birthday. (8)
  7. 16. Scratch around game. (8)
  8. 21. A metaphysician quietly upsetting Polish hero. (11)
  9. 22. A joiner's word. (3)
  10. 24. Hidden one note behind vault. (7)
  11. 26. Monopoly played by the directors? (5,4)
  12. 27. Manage spouse. (7)
  13. 29. Mind half the manual for academic (12)
  14. 31. Mendelssohn's cat? (5)
  15. 34. Nothing in crumpet cooked by PC (8)
  16. 35. Very fond of wine in the wood. (6)
  17. 36. Shake Ted Danson by hair for anniversary (8)
  18. 37. Still, it's quite unusual. (5)
  19. 40. Black ice limits young chap at first left on this. (7)
  20. 41. Content, but extremely hazy, about download? (5)
  21. 42. First word across in the world's first crossword (1913) (3)
Down
  1. 1. Relative in the RAF, unfortunately! (6)
  2. 2. Adore nothing. (4)
  3. 5. Tim (and Mark) was born during troubled reign. (8)
  4. 6. Relatives of a film ruined by first of youths. (6)
  5. 8. Spouse of royal immersed in classwork at Eton. (4)
  6. 10. Relation who's a pest right through (7)
  7. 11. Punishes foul play by the reserves? (5)
  8. 13. Odd peer pawns publication. (9)
  9. 15. A target for the gospeller. (4)
  10. 17. Puzzle that's a hybrid promise. (9)
  11. 18. Reason to have record, I see. (5)
  12. 19. Thoughtful chap has used mint petal. (13)
  13. 20. Far-flung kudos right for anyone's puzzle. (6)
  14. 23. It's evidently bad form not to. (4)
  15. 25. You, it seems. (7)
  16. 28. He uplifts Smith's heart. (3)
  17. 30. Showing consideration or maybe just giving it. (10)
  18. 32. Microprocessor-enhanced light rail makes a comeback (5)
  19. 33. 150 accepted by a French relative (5)
  20. 38. Donegal game fish river and inhabitant of Helsinki, say? (4)
  21. 39. Language concealed by skimpy thong. (6)