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Larus genei
On a second thought, you may be right - at first glance, the black bill-tip looked too large for Slender-billed; and colours of legs and bill too intense... which may be the light in pics as well. Anyway, glad you found it.
Thank you, Zlatan! Unfortunately, I don't agree. I think it is a Slender-billed gull. What do you think?