No — there is no reliable public source currently confirming Matthew Ashley Foster-Smith is left-handed.

Matthew Ashley Foster-Smith is a British actor known for his work in film, television, and theatre. He has appeared in various productions, showcasing his versatility across different genres and roles.

His career includes roles in notable British television series and independent films, where he has often been praised for his nuanced performances and ability to embody complex characters.

Foster-Smith has also engaged in theatre work, contributing to the vibrant performing arts scene in the United Kingdom and demonstrating his stage presence and acting range.

While specific details about his personal life are not widely publicized, he continues to be an active member of the acting community, contributing to various projects.