Episodes with no supernatural element (or in some cases debatable anyway)
1. Where is Everybody
2. Perchance To Dream
3.The Hitch-hiker
4. The Purple Testament
5. A World of Difference
6. The Big Tall Wish
7. Nightmare As A Child
8. A Stop At Willoughby
9. A World Of His Own
10. A Passage For Trumpet
11. King Nine Will Not Return
12. Nervous Man In A Four Dollar Room
13. Nick of Time
14. Dust
15. Twenty Two
16. Static
17. The Silence
18. Long Distance Call
19. Shadow Play
20. The Mind And The Matter
21. The Shelter
22. The Arrival
23. Walking Distance
24. The Grave
25. A Thing About Machines
26. Deaths head Revisited
27. The Midnight Sun
28. A Quality of Mercy
29. Nothing in the Dark
30. Kick The Can
31. One More Pallbearer
32. Person or Persons Unknown
33. The Dummy
34. The Thirty Fathom Grave
35. The New Exhibit
36. Passage on the Lady Ann
37. In Praise of Pip
38. Ninety Years Without Slumbering
39. Sounds and Silences
40. Spur of the Moment
41. The Jeopardy Room
42. Last Night of the Jockey
Any more?