Immediately obvious were the well marked primaries, and I set about capturing as many pictures as I could. Also present was an adult Glaucous Gull roosting on the low tide with other Gulls.
a classic Kumlien's in my opinion. The dark grey primaries with paler edges are obvious, all black bill as well as being an extremely mottled individual.
the darker outer webs on the outer primaries and obvious tail band is unlike Iceland Gull.
darker-centred secondaries, all black bill and the darker primaries are again all pro-Kumlien's features.
another view of the tail band.
(juvenile Kumlien's Gull at Littlehampton Beach)
adult Glaucous Gull
Siberian Chiffchaff at Steyning