[5] Knight wrote the screenplay for the 2013 film Closed Circuit, which was directed by John Crowley and which starred Eric Bana and Rebecca Hall.

[7] Knight wrote the script for the 2021 dramedy Locked Down, about a couple (Anne Hathaway and Chiwetel Ejiofor) attempting a high-stakes jewellery heist during the COVID-19 pandemic.

[9] In March 2023, it was reported that Knight would write the screenplay for an upcoming Star Wars film directed by Sharmeen Obaid-Chinoy, replacing Damon Lindelof and Justin Britt-Gibson.

The film is set to be a continuation to the Star Wars sequel trilogy, focusing on Rey Skywalker's attempts to bring back the Jedi Order.

[11] It was also announced in March 2023 that Knight would be writing the screenplay for a remake of the Alfred Hitchcock film Vertigo for Paramount Pictures, with Robert Downey Jr. eyed for the lead role.

[citation needed] He created and co-wrote A Christmas Carol, a dark adaptation of the Dickens story for BBC One in the UK and FX in the US, starring Guy Pearce as Scrooge and Andy Serkis as the Ghost of Christmas Past, as well as an adaptation of Dickens' Great Expectations starring Olivia Colman as Miss Havisham.

[17] Knight was appointed Commander of the Order of the British Empire (CBE) in the 2020 New Year Honours for services to drama, entertainment and the community in Birmingham.

[1] Knight was a guest on Desert Island Discs on BBC Radio 4 on 11 August 2024, selecting George Michael, Bulgarian folk music, and Harry Lauder (the latter a reference to his support of Birmingham City F.C.