Hi, John.
From these shots I knew it was you, who were in the same hide with us on the same day, left us some impressive kindness introducing some names of the birds. My friend, my wife and I were so thankful for your short stop-by and gave us the info. I saw the gull chasing the Black-capped kingfisher in the scene too. My captures were poor. However, from this occasion and other observation, I found that the gulls were aggressive species that liked to chase those who had food in its mouth. Why is such behaviour, even there are plenty food available?
Best.
Eric