This is another of the Jennings books that were not available in the 90s when I was young, and I think I can understand why. While it is an amusing story, it mostly focusses on the relationship between Jennings and Mr Wilkins - there's nothing in particular that marks it out as special.
The book is, for once, entirely set within Linbury Court school and doesn't feature any notable guest characters. The usual comedic misunderstandings have dried up a bit though, and much of the plot consists of Mr Wilkins being baffled by his pupils' behaviour.
There's a problem with the printing of my copy (the red and white paperback published by House of Stratus). They've left out the illustrations from the original, but kept the captions for them, which just sit in the middle of the narrative. It was really distracting the first few times until I worked it out. I e-mailed the publishers to point this out but have yet to receive a reply (after 12 days).
Overall I found this to be possibly the weakest and least inspiring of the series. The next few are also ones I've not read yet and I hope they are an improvement as I've been quite looking forward to reading some 'new' adventures.