Catherine trained at LAMDA in London, graduating in 2000. Prior to that she earned a BA Hons degree in English Lit and Music at Lancaster University. She won 2nd Prize in the National Theatre/Sunday Times 'Ian Charleson Awards' for her performance as Jessica Madras in Granville-Barker's 'The Madras House' at the Orange Tree Theatre in 2006.

Aside from her TV credits, Catherine has worked extensively in Theatre including 'Shakespeare at the Tobacco Factory' and the 'Royal Shakespeare Company'.