Vipers
Brunswick Birder
I didn't get the best angle to be honest as it was flying more or less South as I was going North and it was dropping below the level of the bushes by the time we were level and it was adjusting its posture for landing... I know that would have been a clincher if it had outstretched neck in level flight.
The posture didn't quite "feel" right for the heron which was made me look twice in the first instance.
There has been a Common Crane seen on and off in the Budle Bay area for a while now. So it is possible.