Audiobooks
All of the original books in the series are available on audiobook, "Beware the Demon Headmaster" and the "Crash Landing" book have yet to be released on Audio. Most of the books in the series are read by Judy Bennett, although Facing the Demon Headmaster is read by Kelly Hunter and not Judy Bennett. Also The Demon Headmaster (the first of the series) was read by Terrence Hardiman and released on cassette.
Read more about this topic: The Demon Headmaster