| Agatha Christie's Marple | ITV1, ITV, PBS | drama television series, crime television series, historical television series | 6 | 23 |
| Agatha Christie's Partners in Crime | London Weekend Television | drama television series | 1 | 10 |
| Agatha Christie's Poirot | ITV1 | detective television series | 13 | 70 |
| Agatha Raisin | Sky One | crime television series | 3 | 16 |
| Age Before Beauty | BBC One | drama | 1 | 3 |
| Agenda | BBC One Scotland | — | — | — |
| Agent Z and the Penguin from Mars | BBC One | — | — | — |
| Agony Again | British Broadcasting Corporation | sitcom | — | 7 |
| AI Confidential with Hannah Fry | BBC Two | documentary television program | — | 3 |
| Ain't Misbehavin' | BBC One | sitcom | 2 | 12 |
| Aircrash Confidential | Discovery Channel | docudrama | 2 | 6 |
| Airline | ITV1 | reality television | 10 | — |
| Airline | ITV | drama television series | 1 | 9 |
| Airmageddon | BBC Children's and Education | — | 1 | 12 |
| Airport | BBC Two | documentary film, reality television | 11 | 96 |
| Airport Live | BBC Two | documentary film | 1 | 4 |
| Al Murray's Compete for the Meat | U&Dave | game show, comedy television series | 1 | 8 |
| Al Murray's Happy Hour | ITV1 | — | 3 | 29 |
| Al Murray’s Road to Berlin | Discovery Channel | documentary television program | 1 | 10 |
| Alan Carr's Celebrity Ding Dong | Channel 4 | game show | 2 | 11 |
| Alan Carr's Specstacular | Channel 4 | — | — | — |
| Alan Carr: Chatty Man | Channel 4 | talk show | 16 | 202 |
| Alan Davies Après-Ski | BBC Two | comedy television series | 1 | 3 |
| Alas Smith and Jones | British Broadcasting Corporation | sketch comedy, comedy television series | 10 | 62 |
| Albert and Victoria | ITV | sitcom | — | 12 |
| Albie | CITV | — | — | 26 |
| Albion Market | ITV | soap opera | 1 | 100 |
| Alcock and Gander | ITV | sitcom | 1 | 6 |
| Alesha's Street Dance Stars | — | — | — | — |
| Alex Polizzi: Chefs on Trial | — | — | — | — |
| Alex Polizzi: The Fixer | BBC Two | — | 3 | 18 |
| Alex Rider | Amazon Prime Video | espionage television series, thriller television series, action television series, drama television series | 3 | 24 |
| Alexander Armstrong's Big Ask | U&Dave | panel game | 2 | 14 |
| Alexander the Greatest | ITV | sitcom | 2 | 13 |
| Alexander: The Making of a God | Netflix | drama television series, documentary, biographical film, documentary television program | 1 | 6 |
| Alexei Sayle's Merry-Go-Round | — | comedy television series | — | — |
| Alexei Sayle's Stuff | BBC Two | comedy television series | 3 | 18 |
| Alfred Marks Time | — | — | — | — |
| Alfresco | ITV | — | 2 | 13 |
| Alias the Jester | ITV | — | 1 | 13 |
| Alice & Jack | Channel 4 | — | 1 | 6 |
| Alien Empire | BBC One | documentary television program | — | 6 |
| Alien Worlds | Netflix | nature documentary, science fiction television series, documentary television program, docufiction, speculative evolution | 1 | 4 |
| All About George | — | — | — | — |
| All About Me | BBC One | sitcom | 3 | 22 |
| All About Two | BBC Two | — | — | 1 |
| All Along the Watchtower | BBC One | sitcom | — | 6 |
| All at No 20 | ITV | sitcom | 2 | 12 |
| All at Sea | CBBC | sitcom | 2 | 26 |
| All Change | — | — | — | — |
| All Clued Up | ITV | game show | 4 | 88 |
| All Creatures Great and Small | BBC One | comedy drama, drama television series | 7 | 90 |
| All Creatures Great and Small | Channel 5 | drama film, comedy film, historical drama | 7 | 48 |
| All for Love | — | — | — | — |
| All Gas and Gaiters | BBC One | sitcom | 5 | 33 |
| All Good Things | — | — | — | 6 |
| All in Good Faith | ITV | sitcom | 3 | 18 |
| All In The Best Possible Taste with Grayson Perry | Channel 4 | — | 1 | 3 |
| All in the Method | — | — | 1 | 5 |
| All New Traffic Cops | Channel 5 | documentary film, reality television | 14 | 179 |