I can't afford a 600mm at the mo and you're not helping
You don't need a 600...just wear some green and find a nice looking twig to stick in a river bank
PMSL
Beautiful shot Ian.
In all seriousness...wear a lot of green or brown now winter is here (perhaps even set up a screen/hide)...and find a photogenic branch that is thoughtfully placed in a known kingfisher useage area...
Now that would be a challenge Phil, may I ask if you have ever photographed one succesfully using this method ?