44.

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Across
  1. 2. Take over on the dance floor
  2. 4. Capture on film
  3. 5. Capture on video
  4. 6. Seize on
  5. 7. Seize on a change of garb down (4)
  6. 9. SUPER MARE Southwest resort features Mae on wonderful horse (6-5-4)
  7. 10. Wonderful start to tracking photon travelling around speed of light
  8. 12. One doggedly capable of a terrific start?
  9. 13. Grab (on to)
  10. 14. Capture on film
  11. 16. Physical well-being is appropriate on loch
  12. 18. Page on wonderful bungalow, perhaps (6)
Down
  1. 1. Promotor of rising cheers terrific start (5)
  2. 2. SLIPPER Persistent complainant seizes on particular fault in footwear
  3. 3. SEIZE ON ITS WAY (9)
  4. 8. Seize on prey (6)
  5. 11. Grab on to
  6. 12. Is inclined to seize on final flair in fashions (6)
  7. 15. CRACKING Seize on wonderful start
  8. 17. Capture on a board