I don't know what the kingfishers might eat but I have seen fish in the river (just tiddlers but tiddlers grow up if they don't get eaten!). Mind you , it's at least 3 or 4 years since I saw one along the Pool - (thanks for clarification Perryman, I always get confused about which bit is the Pool and which is the Ravensbourne).

That sighting was only the second time in my life (and I'm no spring chicken) that I'd seen a kingfisher - the first time was in Ireland when I was about 9 years old - that blue flash is so exciting to see. everytime I walk or cycle along the Pool I keep a hopeful eye out but I've never seen one again.

I've also seen herons along the Pool and Ravensbourne rivers so there must be something for them to eat and I know that a lot off effort has gone into cleaning up the river over the last number of years.