He took an interest in drama from a young age, studying acting at the Central Junior Television Workshop[1] and at the Juilliard School.

[2] He had his first lead role in the film Scott and Sid (2018), and has since starred as Glen Byam Shaw in Benediction (2021) and Coriolanus Snow in The Hunger Games: The Ballad of Songbirds & Snakes (2023).

[5] After the loss of his father, Blyth returned to the Television Workshop[5] and joined the National Youth Theatre,[6] appearing in the productions Twelfth Night, Hay Fever, and A Clockwork Orange.

[8] In 2010, Blyth began his on-screen career with small supporting roles in the films Robin Hood and Pelican Blood.

In the years after graduating from college, he appeared in the short films Fibs (2014), Fluffy (2015), and Wash Club (2016), all while working odd-jobs in Nottingham.

Upon graduating from Juilliard in 2020, Blyth was cast as Glen Byam Shaw in the Terence Davies' biographical drama film Benediction, which premiered the following year.

[14] In March 2024, it was announced that Blyth, along with Russell Tovey, will star in Plainclothes, an independent film from writer-director Carmen Emmi.

The film, which is based on true events, centres around an undercover cop in the 1990s who works to entrap and apprehend gay men until he finds himself drawn to one of his targets.