SPORADIC GULL

The Kumlien's type Iceland Gull put in it's fourth appearance in three weeks and it's never shown for more than a few minutes, at most, each time. The light was strong and the bird came closer but would not pose at a good angle with the light to show off all of it's features. Does it go anywhere else ? It's been seen once at the Walton roost (on the same evening as an adult Iceland Gull which we've not had a sniff of). More pics here:
http://surreybirding.blogspot.com/2011/11/gulls-gulls-gulls.html