The chance to "walk" a brook in the company of a young professional scientist with a particular expertise in river habitats was too good to miss. At the same time it might cast a light onto why a tiny brook in Derbyshire has nothing like the population of wild native brown trout that it really ought to have.. I fished this brook many times as a younger man and enjoyed it even though the catches were never counted in dozens. It was near to home in those days and the owner of the stretch I fished let me fish for nowt as he knew even then I didn't kill wild trout, believing they were too precious to be only caught once.
This "walk" (more like an assault course for weeding out recruits that were not fit enough for the SAS) was going to start much higher upstream from where I used to fish and then work down to my old haunts. The mission was for my leader to begin the careful process of assessing what was going wrong for the trout. Why were they simply not succeeding where, to all intents and purposes, they should be.
Surely this had to be trout heaven. But it is not, so the question was "Why?"
Then we came upon a slower stretch, it was clear there was some form of impoundment downstream of us. We scrambled our way down, circumnavigating barbed wire, electric fences, holly, brambles, briars and much else.