Harry's childhood hobby was acting and then he joined National Youth Theatre at his young age. He also attended London Academy of Music and Dramatic Art and later on he appeared in the plays like The Provoked Wife, King John, Antigone, Plenty and Sisterhood. In 2001, he made his professional acting debut by starring the role of Dudley Dursley in a British-American fantasy film Harry Potter and the Philosopher's Stone. For this role, he earned the salary of £4,000. Next year, he also appeared in the movie Harry Potter and the Chamber of Secrets starring the same role. In 2005, he was seen portraying the role of Young Oliver in a one-off British television drama production Friends and Crocodiles. In 2009, he performed in Royal National Theatre. There he played the role of Swiss Cheese in the stage show Mother Courage and Her Children. His net worth is unknown.