Matthew Sweet is a writer and broadcaster with a doctorate in Wilkie Collins. He presents Night Waves and Free Thinking on BBC Radio 3 and The Philosopher's Arms and The Film Programme on BBC Radio 4.

He is the author of Inventing the Victorians and Shepperton Babylon: The Lost Worlds of British Cinema - which he adapted as a film for BBC Four.

He has also edited and introduced the work of Wilkie Collins, Arthur Conan Doyle, William Thackeray, George Eliot and Edward Bulwer-Lytton.

Simon Guerrier is co-author of Whographica and The Scientific Secrets of Doctor Who for BBC Books, and has written countless Doctor Who books, comics, audio plays and documentaries.

In 2016, Simon was a guest on Front Row and The Infinite Monkey Cage on Radio 4, and with his brother Thomas, makes films and documentaries – most recently John Ruskin's Eurythmic Girls.

Jenny T Colgan has written 16 bestselling novels as Jenny Colgan, which have sold over 2.5 million copies worldwide, been translated into 25 languages, and won both the Melissa Nathan Award and Romantic Novel of the Year 2013. Aged 11, she won a national fan competition to meet the Doctor and was mistaken for a boy by Peter Davison.