| A Tale of Two Cities | MGM+ | historical drama | — | 4 |
| A Taste for Murder | — | — | — | — |
| A Touch of Frost | ITV1 | detective fiction, drama television series | 15 | 42 |
| A Town Called Malice | Q108084483 | thriller | — | — |
| A Very British Airline | BBC Two | factual television program | 1 | 3 |
| A Very British History | BBC Four | — | — | — |
| A Very British Scandal | BBC One | drama television series, historical drama | 1 | 3 |
| A Very English Scandal | BBC One | comedy drama, LGBT-related television series, historical drama | 1 | 3 |
| A Very Peculiar Practice | BBC Two | comedy drama | — | 15 |
| A Very Royal Scandal | Amazon Prime Video | historical drama | — | 3 |
| A View from the Terrace | BBC Scotland | — | — | — |
| A Whole Lifetime with Jamie Demetriou | — | — | — | — |
| A Woman of Substance | Channel 4 | historical drama | 1 | 8 |
| A World of His Own | — | — | — | — |
| A Year in the Life of a Year | — | — | — | 1 |
| A Year in Tibet | — | — | — | — |
| A Young Doctor's Notebook | — | comedy television series | 2 | 8 |
| Aaagh! It's the Mr. Hell Show! | BBC Two | sitcom | 1 | 13 |
| Aap Kaa Hak | — | — | — | — |
| Abandoned Engineering | — | docutainment | 11 | — |
| Abigail and Roger | BBC One | sitcom | 1 | 9 |
| Above Suspicion | ITV | drama television series | 4 | 11 |
| Absolute Cobblers | — | game show | 1 | — |
| Absolute Genius with Dick and Dom | CBBC | documentary film | 5 | 49 |
| Absolute Power | BBC Two | sitcom | 2 | 12 |
| Absolutely | Channel 4 | — | — | 28 |
| Absolutely Fabulous | BBC One | sitcom | 5 | 39 |
| Access | — | — | — | — |
| Accidents Can Happen | BBC One | — | — | — |
| Accused | BBC One | anthology series, drama television series | 2 | 10 |
| Accused | — | — | — | 8 |
| Accused: The Fake Grooming Scandal | Channel 4 | documentary television program | — | — |
| Ace Lightning | British Broadcasting Corporation | speculative fiction, live action/animated television series | 2 | 39 |
| Ace of Wands | ITV | fantasy television program | 3 | 46 |
| Adam Adamant Lives! | British Broadcasting Corporation | science fiction television series, drama television series | — | 29 |
| Adam Smith | — | — | — | — |
| Adam's Family Tree | ITV | — | 3 | 20 |
| Ade at Sea | — | — | — | 6 |
| Adrian Mole: The Cappuccino Years | — | — | — | — |
| Ads Infinitum | BBC Two | — | — | 15 |
| Adult Material | Channel 4 | drama television series | 1 | 4 |
| Adventure Florida | — | children's television series | — | — |
| Adventure Inc. | Global Television Network | treasure hunt film, fantasy television series | 1 | 22 |
| Adventures on Orsum Island | — | children's television series | — | — |
| Affairs of the Heart | ITV | sitcom | — | 7 |
| Afghanistan: The Great Game – A Personal View by Rory Stewart | — | documentary film | 1 | 2 |
| Africa | BBC One, Discovery Channel | nature documentary | 1 | 6 |
| Africa | — | — | — | — |
| Africa's Hunters | — | — | — | — |
| Africa's Underwater Wonders | — | documentary film | — | 5 |
| African Patrol | — | drama television series | 1 | 39 |
| African Queens: Njinga | — | docudrama, biographical film | — | 4 |
| After Dark | Channel 4, British Broadcasting Corporation | — | — | 90 |
| After Henry | ITV | sitcom | 4 | 38 |
| After Hours | — | — | — | — |
| After Hours | — | — | — | — |
| After Life | Netflix | black comedy | 3 | 18 |
| After the Flood | ITVX, ITV | crime television series, mystery television series, thriller television series | 2 | 12 |
| After the News | ITV | — | 1 | 19 |
| After You've Gone | BBC One, BBC HD | sitcom | 3 | 25 |