Juvenile: Westcliff Seafront, Essex - 7th August 2004
This bird is slightly different to the one above but retains the same basic feather patterning. The tertials have less of an Oak leaf pattern but still have the oval patterns on the fringes. The scapulars are neat with clean even fringes. The greater coverts are buffish with dark brown triangles creating the barred effect. The inner greater coverts are noticeably more solid brown with a pattern similar to that of the tertials. The body and head colour is the same as the bird above, mottled warm brown with quite dense head streaking.
Juvenile: Westcliff Seafront, Essex - 7th August 2004
The next bird on the groyne from the above bird. The same typical juvenile Herring Gull pattern is evident: Oak leaf patterned tertials; buff base colour to the greater coverts with the dark triangular notches with darker, more tertial like patterned inner feathers; boldly patterned median and lesser coverts, the obvious dark brown scapulars with neat whitish fringes with hint of white oval  pattern. The overall ground colour is mottled brown.
Juvenile: Westcliff Seafront, Essex - 7th August 2004
A boldly patterned bird. The tertials are heavily patterned on the tips whilst the greater, median and lesser coverts are strongly barred. Note also the strong Oak leaf pattern of the scapulars compared with the above bird. As with the birds above there is strong head streaking, especially around the eye where it is more solid creating something of a bandit mask. Also note the mottled brown under parts, thick set pink legs, the boldly barred undertail coverts and short primary project. This bird gives an almost 'spangled' appearance.
Juveniles:  Wat Tyler Country Park, Essex - 7th September 2003
Here is an example of the variability of the plumages found in juvenile Herring Gulls ranging from the darker end of the spectrum on the left to the almost frosty appearance of the bird on the right. The bird on the right has broad whitish fringes to all the feathers resulting in the colder impression but retains the barred wing coverts and Oak leaf patterned scapulars. There is heavy streaking on the head, especially around the eye. The bird on the left has narrower white fringes to the feathers creating the darker impression. Similarly though it retains the bold barred wing covert and tertial patterns.
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Gulls Index Page

Herring Gull - Larus argentatus
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Juvenile: Private Site, Essex - 9th August 2009
This bird has all the typical characters of a juvenile Herring Gull. The main features that readily identify this bird from other large juvenile gulls are the Oak Leaf patterned tertials (chocolate brown with large pale/whitish ovals on the outer edges), boldly marked greater coverts (pale buffish with obvious dark brown triangles), dark centred median and lesser coverts with broad buffish fringes and dark drown scapulars with broad pale creamy-buff fringes. The body is a mottled brown colour, the legs are thick set and pink. The primary projection is relatively short beyond the terials. The bill is dark, though showing a slight pinkish base, with obvious Gonydeal angle.
Juveniles:  Undisclosed Location, Essex - 26th February 2011
Some Herring Gulls, presumably more northerly argentatus, retain juvenile plumage to the next spring and delay there moult, as in this bird.

Note that nearly all of the scapulars, save two or three are still fully juvenile dark brown centred with white fringes. The next generation feathers are darker anchor marked grey.
Juveniles:  Undisclosed Location, Essex - 10th August 2013
A typical individual showing the warm, golden-buff, tones along with the strongly notched Tertials and Oak Leaf patterned scapulars. The greater coverts are creamy-buff with widely spaced barring.