How well do you know your harbour?

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Across
  1. 4. Maximum power-driven boat speed through, over or on the water? (5,5)
  2. 6. The Harbourmaster's previous southern Manor? (9)
  3. 8. Invader competing with indigenous bivalve mollusc? (7)
  4. 10. Pen this groin reshuffled for a harbour hamlet (Cryptic 7,5)
  5. 12. Large navigation mark seaward of The Bar? (4,4)
  6. 15. Bronco bucked wildly (Cryptic 6)
  7. 22. The fastest growing sport in the harbour? (6)
  8. 25. Number of international and national nature designations in harbour? (4)
  9. 27. Pious fellow killed by polluted oyster in 1902? (4,2,10)
  10. 29. What you should wear at all times when afloat? (10)
  11. 31. Number of Grey Seals in harbour? (5)
  12. 32. Cycle route from Chichester to East Head? (8,3)
  13. 33. Name of the Harbour Office hound? (4)
  14. 35. A mob’s confused about harbour village (Cryptic 6)
  15. 36. Chichester Harbour Radio channel? (8)
  16. 38. River town’s quiet charm hides a sailing haven (Cryptic 8)
  17. 41. Last example of working Oyster sailboat from Emsworth’s Oyster industry? (6)
  18. 42. The oldest purpose-built marina in the UK? (7,4)
  19. 44. Stunning Twelfth Century Church at Apuldram? (2,5)
  20. 47. The Conservancy's electric tour boat? (5,8)
  21. 48. Globally, the second most effective natural sequestrator of carbon? (9)
Down
  1. 1. Primary cause of damage to saltmarsh? (4,3,5)
  2. 2. I Judge this to be the Birthplace of windsurfing! (7,6)
  3. 3. Location of Conservancy Tern rafts? (7,5)
  4. 5. When Terns meet, they remain? (10)
  5. 6. How many sailing clubs are there in the harbour? (8)
  6. 7. The largest known Roman residence north of the Alps? (10,6)
  7. 9. The largest European wading bird found in the harbour? (6)
  8. 11. Approximate number of visitors to harbour each year (in millions)? (3)
  9. 13. Really very highflyer raised in Westborne (3,5)
  10. 14. The Conservancy Lead Ranger's favourite snack? (4,3)
  11. 16. Chichester is internationally important for this bird? (5,6,6)
  12. 17. "Not really an island though is it, Sarge?" (7)
  13. 18. Fools indicate gold between Itchenor and Dell Quay! (8,5)
  14. 19. Resolute King with damp feet at Bosham? (6)
  15. 20. Non-slip sailing safety knot? (7)
  16. 21. Fashionable mobile harbour seen in Langstone in WW2? (8)
  17. 23. Number of Harbour Seals in harbour? (6)
  18. 24. The Conservancy's Education Centre that has helped 200,000 students? (4,4)
  19. 26. Shallow water to West of East Head? (3,6)
  20. 28. Never cross this wind over tide? (3,3)
  21. 30. Miles of navigable channels in harbour? (9)
  22. 34. Formerly called an AONB - now? (8,8)
  23. 36. Number principal channels in harbour? (4)
  24. 37. Hamlet child oddly misplaced in marshland (Cryptic 7)
  25. 39. The Conservancy's flying educational mascot? (5)
  26. 40. Ancient oak woods North of Chichester Marina? (7)
  27. 43. Number of Nature Reserves in harbour? (4)
  28. 45. Angling for this protected fish from a boat is prohibited between 30th April and 1st November? (4)
  29. 46. Moderate tides when the sun and moon are at right angles to each other? (5)
  30. 49. Number of Tern species that breed in harbour? (3)