Mail on Sunday £1500 prize puzzle (no 1644)

Near as I can figure it, as viewed through the possibly flawed perceptual filters of my own reality tunnel, the most likely answers seem to me to be:


Across:

1. Bill Hayley
6. Snow Goose
11. Janice 
12. Bambi
14. Retina
15. Pawnee
16. Wounded
17. Goya
18. Chuzzlewit
22. Guernica
24. Tin Cup
26. Gregg
27. Island
28. Limousin
29. Ugly Sister
31. Apes
33. Ant Hill
36. Persia
38. Juneau
39. Rossi
40. Ishtar
41. Abyssinia
42. Agamemnon


Down:

2. Ivana
3. Leibniz
4. Arete
5. Elbow
7. Naiad
8. World Series
9. Octagonal
10. Sonny
13. Mount Vesuvius
19. Heidi
20. Lapis Lazuli
21. Wigan
22. Gogol
23. Canoe
25. Cross Keys
30. Sorghum
32. Plumb
34. Tarsi
35. Laing
36. Priam
37. Idaho