IME canoeists seem more interested in litter, however wild swimmers I hold more hope for.JCP, I am not suggesting you or anyone else goes tramping the countryside looking for discharges, but if you see one where you fish report it. Next time you are there and it's doing it again, report it and report it every time you go there. When you have a nice list and have had no response from the EA which THEY ARE REQUIRED TO UNDER NIRS, then you move to next level.
I promise you, nothing causes more of a stomach upset in senior management than a few pointed questions from an MP. Chickens minus head.
The alternative, of course, is that we do nothing and it is the wild swimmers and canoeists who kick up the fuss and anglers are left on the sidelines. Government than assumes that seeing as we aren't too bothered we can safely be ignored. Anyone want that?