The Chiffchaff managed to elegantly stretch across the gap to reach whatever it was that it had found to nibble, while staying in the dry.
I can't remember which wildlife photographer it was that told me to always try to get the camera down low when taking pictures of birds on the water, but it is definitely a good idea. Of course, standing in the water, bending forward holding a camera and long lens above the water while squinting at a screen to see if you have the thing in focus is a skill in itself.
Like the Chiffchaff I also managed to stay dry while taking this (and more importantly keep the camera dry), although I did have one moment when something moved under my wellie boot and I thought that I might have made a very expensive mistake. It would have been particularly frustrating because, it's not even that great a photo when all is said and done.