Catherine can be heard on everything from national TV and radio campaigns, to computer games, to radio drama, to audio books. Her Audible Page lists her reading of fiction and non-fiction books and appearances in audio drama, the latest being George Orwell's 1935 novel A Clergyman's Daughter for Penguin. Other recently narrated Penguin titles include Ten Thousand Light-Years from Home - a selection of stories by pioneer of feminist science fiction James Tiptree Jnr., (born Alice Bradley Sheldon) and How To (Almost) Make Friends on the Internet by Michael Conningham. She was also part of the weird and horrifying HP Lovecraft-inspired tale Arkham County, starring Stanley Tucci and Alex Kingston.

Other notable voice work includes reading The Complete Essays and Poems of Edgar Allen Poe and The Gendered Brain (both for Penguin), as well as appearing as The Queen of France in The 3 Musketeers and Mary Darling in Peter Pan, (both for Audible) and episodes of Dr Who and Blake's 7 for Big Finish.

Details and clips of her readings can be found on the Penguin Books' directory Ahab​. 

She has also provided voices for computer games such as Assassins Creed: Valhalla, The Bradwell Conspiracy, Greedfall and Elite Dangerous, which is featured in the video below: