After a third hand report from fishermen of Bitterns making a noise at WSL 2 nights ago, I went down tonight. Passing the Ferruginous at Heron's Water en route.
I found one Bittern immediately, pretty much in the middle, then the second middle right, neither looked alert and they never really moved. Water Rail called, but nowt else happened.
I never complain when I see one Bittern, let along two.