The brown-washed primaries and tail band on this bird are characters of a Kumlien's Gull, this bird seen in fields near the Cashen Estuary, 30th November 2015 (D.Farrar).
A more typical first-winter Iceland Gull, one of two present, also in fields near the Cashen Estuary, 30th November 2015 (D.Farrar).