Ritchie was educated at Benjamin Britten High School in Lowestoft and later became a member of the National Youth Theatre. He performed at The Seagull Theatre in Pakefield, Lowestoft.
After being spotted by a casting director during one of his monologue performances at the Soho Theatre in London, Ritchie was suggested for a role in director Roland Emmerich's 2008 epic 10,000 BC, in which he subsequently played the role of Moha.
In Peter Jackson's 2009 film The Lovely Bones (based on Alice Sebold's novel of the same name), Ritchie played Ray Singh, the love interest of the main character, Susie Salmon.
In February and March 2010, he starred as Puck in A Midsummer Night's Dream at the Rose Theatre, Kingston with Judi Dench.
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