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I'm not confident enough to make an ID but that bird looks like a cormorant to me. Its forehead isn't steep enough for a shag and it doesn't seem to have that funny crest of a shag.
Think I agree with Bill. Don't male AND female shags have crests when breeding so shouldn't it have one now?
I ask because I'm uncertain...
Feel free to look at my ongoing (hopefully improving) collection of pictures on Flickr:
Lat/Lng: 56.0601, -2.693
OS grid ref: NT569854