Happy Anniversary

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Across
  1. 2. the land and scenery of a rural area (11)
  2. 9. american divorcee (7)
  3. 11. use and development of computer systems (15)
  4. 12. yellow matriarch (5)
  5. 13. sci-fi series (16)
  6. 15. having a meaning that is mysterious or obscure (7)
  7. 16. a current score or amount (5)
  8. 18. attach or join (5)
  9. 20. small spikes attached to footwear (5)
  10. 22. person of exceptional holiness (5)
  11. 23. plough with a double mouldboard (6)
  12. 24. essayist and poet (15)
  13. 25. carbonated drink with a cola flavour (5)
Down
  1. 1. the date on which a romance began (11)
  2. 3. post republican state (11)
  3. 4. fantasy card game (17)
  4. 5. private room (plural) (8)
  5. 6. a puzzle consisting of a grid of squares and blanks (9)
  6. 7. drink without caffeine or sugar (8)
  7. 8. competition for students (19)
  8. 10. a type of music of black American origin (4)
  9. 14. formula for determining conditional probability (12)
  10. 17. synthetic block (4)
  11. 19. 1975 American musical (7)
  12. 21. colourful flower (8)