Lesser Black-backed Gull 5cy SH2, April 22 2002, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). 

An adult ringed, left white SH2. Note the peppered iris, the diffuse black bill-band, the relatively small white tips on the outer primaries and the medium sized mirror on p10. These characteristics may apply to near-adult, and this individual is only in 5cy, born year 1998 and ringed close to the present breeding spot on June 20 1998.