Thank you Stella. I liked the story
Now I know what's what of the big ones, so I definitely have daphnia (I should have realised earlier as they are the same colour as the dried ones I feed the fish), and ostracods and now I can also recognise the copepods too. There are some other critters that are smaller than daphnia even but it's impossible to identify those ones, they might be mini ostracods.
I left a bucket of water out yesterday to condition itself and today transfered the remaining survivors from the original supply (copepods had mostly all died today). Then I went back to the trough and got me some more bugs and a few bits of leaf and twig from the area - thus presenting my first bucket biotope of a sheep trough in Cornwall Park :lol: Aside from the fact that it's in a plastic bucket and that I fed them tropical fish flakes, it's quite environmentally correct. Next thing is to get my husband to make me a basic stand for a small tank and set it up in the garage. It gets a little direct sunlight in there but should I give them a light? Something simple like a normal lightbulb, I was thinking of.