I crediti di Marc includono Peter Pan (Teatro Nazionale), The Flying Lovers of Vitebsk (Bristol Old Vic, Sam Wanamaker Playhouse, UK Tour) The Trial (Young Vic), Taken At Midnight (Theatre Royal Haymarket, Chichester Minerva), Amadeus (Chichester Festival Theatre), From Here To Eternity (Shaftesbury Theatre), Matilda (RSC Courtyard Theatre, Cambridge Theatre), Singin 'In The Rain e The Music Man (Chichester Festival Theatre), Into The Woods e Hello, Dolly! (Regents Park Open Air Theatre), Billy Liar (UK Tour), Imagine This (New London Theatre).
London Road, Coconut Shy, Love Actually e More Than Love. Marc è candidato all'Olivier Award per il ruolo di Seymour in Little Shop Of Horrors, Regents Park Open Air Theatre.

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