There was an episode of Hetty Wainthropp Investigates which involved a bit of a conflam between some cavers who said a university caving club had de-rigged their ropes whilst they were still underground - the university club counter-claiming that they had a permit and the marooned club didn't and so that they were not at fault. Twenty minutes of sleuthing later, it turned out that the university club was not actually a 'bona-fide' club as they were in fact a from polytechnic, which invalidated the permit they had got from the controller of the small caving area in which they had been marooned. Well, the controller of the small caving area was rather piqued as you could imagine. He jumped up and down and shouted a lot; "Mein Gott" he said, along with "achtung, donner und blitzen, ze caving is for you Tommy soon to be over".
There was some mild confusion when Hettie got side-tracked by the inevitable cordura vs PVC debate, which whilst true to the original novella, did detract slightly from the overall narrative of the programme.
In conclusion: Better than the Poirot de-rigs the SC3, but not as rewarding as the Z Cars episode in which Jock Weir (admirably played by Joseph Brady) helped in trying to stabilise the third choke in Aggy.