This image shows the normal tail pattern of a first winter Herring Gull. The black bond is broad in the middle and gets narrower towards the sides, with quite a lot of barring on inner part of rectrices, upper tail-coverts and rump.
Some of the Herring Gulls show tail pattern like the gulls on the images to the left and below. A very thin and even broad black bond, with some barring on inner parts. Could recall the one of Great Black-backed Gull.
In this image the tail is really hard to see but it's possible to imagine the tail has the same type of pattern as the one above.
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