I was sitting in the hide overlooking Holton Fen at dusk (4 47 pm) when a Bittern flew across the water near the wood to my right, then dissappearing over the phramites reed bed. It has been spotted a couple of times recently, initially by Dave Blackledge.
According to Collins Bird Guide, they will only breedi in extensive phragmites reedbeds, of which there is a large one on Holton Fen - previously planted by the Thursday…