Mainland Sunbeam

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Across
  1. 5. an epee-maybe not
  2. 8. moves fore and aft on some models
  3. 11. the source of many a photon
  4. 15. a driveway terror?3,5
  5. 17. advancement after also fitting a shorter shaft
  6. 19. the antithesis of a slow front
  7. 21. maybe not a soft bottom
  8. 22. old racer known for creating feline
  9. 23. definitely not one of the islands
  10. 24. often in yellow and with good voice
  11. 26. what is the orb missing
Down
  1. 1. lighter between the ears?5,4
  2. 2. non heavy issigonis invention?
  3. 3. did being sent to silence produce this engine?8,6
  4. 4. rootes fairground colour
  5. 6. did it really earn its stripes
  6. 7. many of these passes feature in European rally’s
  7. 9. a useful component when changing shaft direction
  8. 10. nemesis of many a stromberg
  9. 12. even Lewis started in one of these
  10. 13. a Phil Collins favourite used on rear axles
  11. 14. desirable engine
  12. 16. sometime rooters assembler
  13. 18. neither a top or a bottom trip
  14. 20. definitely not a gnome
  15. 21. Diana?
  16. 25. the underpinnings of all alpines