I spent a couple of hours on site yesterday morning and managed to see both species, a 2nd winter Iceland Gull and a juvenile/1st winter Glaucous Gull.
Also seen on site were over a dozen Cormorants, several Shags, Eider Ducks (make and female), Black-headed, Great Black-backed, Herring and Common Gulls, a winter-plumaged Kittiwake (my first ever) and a Turnstone.
Kittiwake (note the dark smudge on the head)
88 – Shag
89 – Eider Duck
90 – Turnstone
91 – Iceland Gull
92 – Glaucous Gull
93 – Kittiwake