The Demon Headmaster Books were originally issued in-between the years 1980s and the early two thousands, with the first book "The Demon Headmaster" first being published in 1984 and the last SPLAT book "Facing the Demon Headmaster" being published in 2002. The books have been republished many times over the years with many different covers as well as small changes to the books text.

Demon Headmaster

Main Article: The Demon Headmaster (Book)

• In the original version of the book, SPLAT use a pocket tape recorder to bug the school assembly to find out what was going on. This is updated in later books when SPLAT now use one of their parent's old mobile phones to record assembly.

Prime Minsters Brain

Main article: The Prime Minister's Brain

• At the start of the book, Dinah is sitting in the Hunter's garden writing a computer program out on a pad of paper to help SPLAT pick activities for the Summer hoildays. In the original issue, we are given the text of Dinah's program, which is written in the programming language Basic which was popular at the time. Later issues change this by removing the programming code or changing it to her building a website.