Heron / No Kingfisher

I have recently found a pair of Kingfishers nesting on a public duckpond near to my home in Dorset. I have seen them fly in and out of what I think is there nesting area and fly up and down the pond past oblivious onlookers feeding the ducks. I have been unable to photograph them yet but It is at the same location as a shot I took last year (below)

However while I have been waiting for them I have been able to photograph a number of other species. A grey heron has been a regular visitor and other types of ducks including mallards with young.