Iceland Gull

after looking through about 10000 gulls on the local slurry fields for 2 weeks and finding nothing but Meds today there were only about 2000 gulls but a striking 3cy Iceland Gull at about 1200m range as usual -- after the rain it went missing so on a hunch I went to the Humber and found it near the bridge where it was close enough for some reasonable photos -- according to the gulls book, as I read it, this bird could be indistinguishable from the pale end of 3cy Kumlien's