Well that's the Wildlife Photograph of the Year Prize sorted:
What do you mean, what is it? It's a heron, of course: a Grey Heron (Ardea cinerea) no less. Standing in a drained section of the Hertford Union Canal in Hackney. When an opportunity like this comes along, you have to grab it.
Elsewhere, below Lea Bridge Road:
A seemingly random view, but a closer look reveals how much skill has gone in to the framing of the shot. Note how the blue and yellow colour block of the fencing on the right is echoed in the blue yellow and green of the boat, while the red and white barrier is cleverly mirrored by the red and white of the tiller. The arrow sign reinforces the perspectival pull of the triangles on the bridge as they draw the eye over to the left, while the path winds its way up into the centre then to the right, creating a dynamic tension....
And here's a boot: