Troublesome Gulls

Hard going to find birds today, a few Jackdaws and Carrion Crows on the cricket pitch,A song thrush flushed from long grass had me going for a split second and a Pied Wag was the highlight from the mill car park.4 Goldfinch,9 Stock and 1 Collard Dove from Chelsea Valley .Then a load of Gulls in the bottom field,40 Common and 30 or so Black heads nothing else ,then 2 adult Herring Gulls popped into view,small and clean cut made me think Argenteus, then one more a lot bigger and paler grey made me think of YL /Aregentatus type , then a fourth in second winter plumage with very long neck with grey streaks down the sides, and black beady eye. Interesting,,, but without a better view I was never going to put it to species. I crawled along the wall as not to flush um for about 150 yards, popped up all the gulls still present, except the two interesting ones could not find um anywhere........One Mistle thrush was no consolation on the way back...