Longworth has appeared in many TV series[2] including The Legacy of Reginald Perrin, Nathan Barley, Nighty Night, The IT Crowd and Extras.
Longworth provided the voices of Lott Dod and Gragra in Star Wars: Episode I – The Phantom Menace.
Longworth is a voice actor and has recorded over 200 audiobooks[4] and audio dramas, for authors such as Iain Banks, Jeff Noon and Peter F. Hamilton,[5] and books such as Rendezvous with Rama.
In Judge Dredd: Solo he provided the voices for all 34 roles, occasionally with vocal effects and multi-track recording.
In 2013 Toby voiced the protagonist and main character Oswald Mandus in the videogame Amnesia: A Machine for Pigs.