Just William is an enduring series of stories about an errant schoolboy from a solidly upper-middle class family in Edwardian England. Due to their subject and humorous nature they are typically perceived as children's literature.
However, it is quite common online to find claims that their author, Richmal Crompton, originally intended them for an adult audience. There is some circumstantial evidence for this: she also wrote a lot of adult literature and the density of language in the stories is beyond most children at William's 11-12 years of age.
On investigation, I cannot find any solid evidence to support this supposition. Did Crompton intend the stories for an adult audience?