Hi Deborah!
The one on the water looks, as you say, similar to Keith´s, and a 1st winter as well.
The flying looks a little bit older (?) such heavy wear and moult of primaries seems a little early, although argenteus (southern pop) usually moults earlier than argentatus, it could well be though, an extremely worn and early moulting individual. But as moult of primaries starts with innermost p1, and this one seems to have 3-4 new inner primaries on both wings, so not just a damage, fully grown, it is a bit odd this time of year, when usually not have started primary moult. Tail looks pale tipped from below, usually a dark band at this age. A Herring Gull It is Deborah I would say.
JanJ
JanJ