Jolly Hockey Sticks Part 4.
The fourth part of the St. Trinian's themed films is the first to be shot in colour, and also the point where someone should have realised that this series had run out of steam. Based on Ronald Searle's demonic schoolgirls, this outing cribs off of the topical Great Train Robbery of the 60s, retains George Cole as a reassuring presence, while adding Dora Bryan and Frankie Howerd for some acting solidification.
It's not a bad film as such, in fact the last quarter, where a whole host of train shenanigans come into play, is great fun, it's just that it feels tired, less risky, like the makers were hedging their bets to get a box office winner (which came to fruition). Fast framing is a bit of a cheat, Howerd is wasted - or sleepwalking through the film? But Bryan is on hand for a bit of quality while the girls are all boisterous and minxy.
Enjoyable enough for those so inclined, even if it's utterly forgettable come the final credits. 6/10