? gulll and a few others

initially we had the upper gull down as a 2cy Caspian, always fairly distant, but comments from a couple of colleagues have caused me to reassess the bird and I think it best left as a ? at present -- inevitably it flew off without anyone seeing the wing or tail pattern

still lots of gull potential on the patch with 11 species so far this week including a fine adult Little Gull last night,  13 Meds  and 13 Meds including 3 colour ringed birds;

3rd from bottom an easy ID even on this view -- bottom two a slightly odd looking 3cy Common Gull? head pattern not just staining and upperpart tone distinctly colder and darker than adult and 2cy Commons and a very white dainty head shape?