Bob's latest prompted me to trawl back through my blog posts, in those days unsupported even by a point'n'shoot camera - and sure enough the Med gull has been coming to Carew for its holidays since at least August 2014!
http://pembsbirds.blogspot.com/2014/08/carew.html
http://pembsbirds.blogspot.com/2015/08/carew-millpond.html