Prior to graduation, McGuire had been a member of Playbox Theatre Company, and was involved in minor radio dramas and Shakespearean productions. While still a drama student, he first came to attention or his role in the premiere of Laura Wade's satirical play Posh in which he portrayed a student member of the "Riot Club", a parody of the Bullingdon Club at Oxford University.

Filmography

• 2027National Theatre at Home: Samira — Dan
• PONIES — Phil
• 2025My Mother's Wedding — Jeremy
• 2024Blitz — Clive
• The Gentlemen — Pete Forbes Spencer
• 2023Saltburn — Henry
• 2023Sweet Sue — Soho Punter
• The Famous Five — Harry Maddox
• The Gold — Douglas Baxter
• 2022All My Friends Hate Me — George
• Anatomy of a Scandal — Chris Clarke
• Cheaters — Josh
• 2022Fisherman's Friends: One and All — Gareth
• 2022Paranormal Investigators — Terry
• The Man Who Fell to Earth — Zach
• 2021The Duke — Eric Crowther
• 2020Artemis Fowl — Briar Cudgeon
• 2020Boys On Film 20: Heaven Can Wait — Liam (segment "Mine")
• Industry — Michael Walker
• 2019Grace Under Pressure — Jean-Paul Goude
• 2019National Theatre Live: I'm Not Running — Sandy Mynott
• 2018Bees Make Honey — Mr. Conick
• 2018Old Boys — Huggins
• 2018The Happy Prince — Ambrose Smithers - Undergraduate #1
• 2017Mine — Liam
• 2017National Theatre Live: Rosencrantz & Guildenstern Are Dead — Guildenstern
• Love, Nina — Nunney
• 2016Regardez — Tony
• 2015Cinderella — Palace Official
• 2014Get Santa — Tony
• Lovesick — Angus Baker
• 2014Mr. Turner — John Ruskin
• Siblings — Jack
• 2013About Time — Rory
• A Young Doctor's Notebook — Even Younger Doctor
• Misfits — Ollie
• Challenger Deep — Producer
• Scope — Producer
• Untitled 13

Appearances as themselves (1)

• The Graham Norton Show — Self