Other major television roles include Deano in Gavin & Stacey, Chris Pitt-Goddard in Spy, Simon in Peep Show, William Agar in Quacks, and twin brothers Jamie Winton and Ariel Conroy in You, Me and the Apocalypse.

He graduated with first class honours from the Rose Bruford College of Speech and Drama,[2] and later trained in clowning at École Philippe Gaulier in Paris.

Baynton explained his motivation in an interview with Metro: "The performing instinct came from making my family laugh, so I've always been drawn to the funny side of things.

Along with the other members of the troupe, Baynton is the creator, writer, and star of Yonderland, a family fantasy comedy series that premiered on Sky One on 10 November 2013.

[6] He starred with the same troupe in Bill, a BBC family comedy film based loosely around the early life of William Shakespeare, who ventures to London to pursue his dream of becoming a playwright.

Baynton teamed with friend and fellow Gavin & Stacey alumnus James Corden to create, write, and star in The Wrong Mans, a comedy thriller for BBC Two that premiered in autumn 2013.

[14] In late 2015, Baynton portrayed Jamie Winton and his brother Ariel Conroy in Sky One's science fiction comedy-drama miniseries You, Me and the Apocalypse.

In January 2025, it was announced that Baynton would appear as a contestant on the nineteenth series of the Channel 4 show Taskmaster alongside Fatiha El-Ghorri, Jason Mantzoukas, Rosie Ramsey, and Stevie Martin.