Hayley Williams was an assistant editor credited on the following Class and Doctor Who stories:
- For Tonight We Might Die
- The Coach with the Dragon Tattoo
- Nightvisiting
- Co-Owner of a Lonely Heart
- Brave-ish Heart
- Detained
- The Metaphysical Engine, or What Quill Did
- The Lost
- The Woman Who Fell to Earth
- The Ghost Monument
- Rosa
- Arachnids in the UK
- The Tsuranga Conundrum
- Demons of the Punjab
- Kerblam!
- The Witchfinders
- It Takes You Away
- The Battle of Ranskoor Av Kolos
- Resolution
- Spyfall
- Orphan 55
- Nikola Tesla's Night of Terror
- Fugitive of the Judoon
- Praxeus
- Can You Hear Me?
- The Halloween Apocalypse
- War of the Sontarans
- Village of the Angels
She worked alongside Gareth Mabey for Class, and together with David Davies for Doctor Who.