At this time of the year, I'm never sure when I'll see the last of the wintering Black-headed Gulls at Rufford. Last Saturday I popped across and found about 80 still present, including many looking very smart, with their breeding plumage brown (not black!) hoods.
The first bird I saw, was 215C, and this bird was certainly looking smart. Last year, my last sighting of this bird was on 12th March, so this may be my last sighting until after the breeding season. We've not had any sightings at a breeding site yet. This year perhaps?