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Martyn began his career in the film and TV industry in the 1970s, working in exhibition by programming arthouse cinema and festivals, as well as in film journalism, notably as a critic for Time Out in London. In 1984, he transitioned from criticism to production by joining the BBC Drama Department. Quickly rising to the role of producer, he created several TV movies during his five-year tenure in drama. In 1989, he was headhunted by Palace Pictures, where he guided the successful indie film company into TV production, delivering a range of thrillers, comedies, and music specials before the parent company folded. During the 1990s, Martyn returned to television, producing numerous prime-time dramas for ITV UK, including Heartbeat, A Touch of Frost, and PD James Mysteries, as well as creating original one-off films for the BBC such as A Foreign Field and Soul Survivors through Trisquare, a company based at Pinewood Studios. In the 2000s, he served as Production Chief at a TV production company, collaborating closely with media investors at Close Brothers Merchant Bank in London’s financial district. Following this, he established his own company to develop and produce film and TV content. His first independent venture, Suitable Viewing, produced a highly successful adaptation of the children's classic Heidi. Under his new company, Life & Soul Pictures, Martyn wrote the charity short film Bounce and developed Ball Boy, a feature film optioned by an Italian producer. In 2009, he produced Ways to Live Forever, a UK-Spain co-production written and directed by Gustavo Ron, starring Ben Chaplin, Emilia Fox, and Greta Scacchi. The film was released nationwide in the USA in 2010 by Worldwide Motion Pictures and earned six awards.