Miss Saigon (Folketeatret, Oslo); A Midsummer Night's Dream, Julius Caesar (Fort Canning Park, Singapore); Stumped (Screen, Lords, Hampstead, UK Tour); Bring It On (Southbank Centre); The System (Screen); My Fair Lady (Grange Festival Opera & The Liceu, Barcelona); Being Mr Wickham (Screen, Queen Mary 2, UK tour, New York); Of Mice and Men (UK Tour); Some Mothers Do 'Ave 'Em (UK Tour); Hand To God (Singapore Repertory Theatre); Moving Stories (Haymarket, West End and Houses of Parliament); The Food of Love (Cadogan Hall, Royal Festival Hall); Cool Rider (Lyric & Duchess, West End); The Collector, Death and the Maiden (English Theatre Frankfurt); Cinderella (Manchester Opera House, Nottingham Theatre Royal); Peter Pan, Jack and the Beanstalk Snow White (Manchester Opera House); A Night with Bonnie Langford (London Hippodrome, Richmond Theatre); Farragut North (Southwark Playhouse); Someone Who’ll Watch Over Me (Cockpit). Other titles: Sweet Smell of Success, Company, Marguerite, Fresher the Musical, Play-in-a-Day Series, Metamorphosis, The Bear Who Paints, Proof, Made in Dagenham, Billy, The Ghost Train, Into the Woods, Humble Boy, Disco Pigs, Guys and Dolls, Merrily We Roll Along, Thoroughly Modern Millie, Lucky Stiff, and The Laramie Project.

Guy has trained actors and directors at Arts Ed, RADA, British American Drama Academy, Mountview, Liverpool Theatre School, Trinity-Laban, Tisch NYU, The Urdang Academy and Italia Conti.