HELP! What animals and plants live in UK rivers

I really need to find out this information, so if you do know the answer could you please help?

I need to find out what Animals and Plants live in UK rivers?

Birds (swans, ducks, cranes, kingfishers)
Fish (trout, carp, minnows)
Frogs
Turtles
Otters
Insects
Willows
Rushes
grasses
Reeds
mosses
algae
No beavers or similar, no snakes there that I have heard of.
http://www.waterscape.com/features-and-a…