It was way backlit and the above photo is cropped in a fair bit. It was headed in slowly and then a dog walker decided to stop and talk and the birds started swimming back out, away from the Labrador. Oh well.
The backlit semi-overcast created an exposure challenge, but I managed some workable images. This bird is just starting the moult with a little color coming in behind the eye and a couple black facial feathers. About 40% of the birds looked like this.
About 30% of the birds were in the confusing transition with wisps of ochre behind the eye and some patchy black feathers coming into the face.