With the trees greening up, the herons are difficult to see at the heronry now. I shot this image this morning from the riverbank, 150 metres away from the nests. These were the only herons I could see, but I could hear a lot of beak clacking from other areas of the heronry.
I stood in the mud at the outlet of the North Pond Chain into the River Stour, which is a very sticky place to be standing still for more than a few seconds; stay longer and the mud sucks you down. The herons might be completely hidden by the end of next week.