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I am uncertain whether this in a European shag or a black cormorant.
Again, Marek, please do not make an ID suggestion when the same species has already been suggested. I have removed this suggestion in addition to the other spottings you have done this on. Simply tick the +1 box in the right corner of the suggestion already in place, thanks!
I think the shag is a more coastal bird, so you would be unlikely to see it inland.