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I would have said the leaves are finer than on a Californian poppy plus more branched
I think the leaves are more like those of the Californian rather than the similar Icelandic poppy, which has slightly broader leaves that are wider at the ends, rather than so frondy but difficult to distinguish it easily from this photo.
cosmos flowers have more than 4 petals
Lat/Lng: 52.3, -2.4
OS grid ref: SO7874