| 1981 | Horizon Season 1981 Episode 27 – Painting by Numbers | | 0 | 10 years |
| Horizon Season 1981 Episode 26 – The Race Against Time | | 0 | 10 years |
| Horizon Season 1981 Episode 25 – The Cornucopia | | 0 | 10 years |
| Horizon Season 1981 Episode 24 – The Pleasure Of Finding Things Out | | 0 | 10 years |
| Horizon Season 1981 Episode 23 – Death of the Dinosaurs | | 0 | 10 years |
| Horizon Season 1981 Episode 22 – The Race to Ruin | | 0 | 10 years |
| Horizon Season 1981 Episode 21 – Science for the People | | 0 | 10 years |
| Horizon Season 1981 Episode 20 – Butterflies or Barley? | | 0 | 10 years |
| Horizon Season 1981 Episode 19 – The Grid | | 0 | 10 years |
| Horizon Season 1981 Episode 18 – Breaking in Children | | 0 | 10 years |
| Horizon Season 1981 Episode 17 – The Hunt for the Legion Killer | | 0 | 10 years |
| Horizon Season 1981 Episode 16 – Heads I Win, Tails You Lose | | 0 | 10 years |
| Horizon Season 1981 Episode 15 – Resolution on Saturn – The Moons | | 0 | 10 years |
| Horizon Season 1981 Episode 14 – Resolution on Saturn – The Rings | | 0 | 10 years |
| Horizon Season 1981 Episode 13 – East of Bombay | | 0 | 10 years |
| Horizon Season 1981 Episode 12 – Did Darwin Get It Wrong? | | 0 | 10 years |
| Horizon Season 1981 Episode 11 – Voices From Silent Hands | | 0 | 10 years |
| Horizon Season 1981 Episode 10 – Hello Universe! | | 0 | 10 years |
| Horizon Season 1981 Episode 9 – Gentlemen, Lift Your Skirts | | 0 | 10 years |
| Horizon Season 1981 Episode 8 – West of Bangalore | | 0 | 10 years |
| Horizon Season 1981 Episode 7 – Who Will Deliver Your Baby? | | 0 | 10 years |
| Horizon Season 1981 Episode 6 – A is for Atom, B is for Bomb | | 0 | 10 years |
| Horizon Season 1981 Episode 5 – Living With Dying | | 0 | 10 years |
| Horizon Season 1981 Episode 4 – No-One Will Take Me Seriously | | 0 | 10 years |
| Horizon Season 1981 Episode 3 – The Qualyub Project | | 0 | 10 years |
| Horizon Season 1981 Episode 2 – A Whole New Medicine | | 0 | 10 years |
| Horizon Season 1981 Episode 1 – Spend and Prosper | | 0 | 10 years |
