Norfolk status Common immigrant. Breeds every summer, but winter survival rare. Several generations, most frequest May - Sept. Can turn up in thousands under the right conditions, especially at coastal migration watch-points. Recent research shows the Silver-Y flies at altitudes of up to 1.2km when migrating!
Recorded in 68 (99%) of 69 10k Squares. First Recorded in 15. Last Recorded in 2015.