It looks very much like a white corn-cockle (Agrostemma githago). Corn-cockles were once very common in the fields, but the use of herbicides means they are quite rare in the wild now, although are often included in wild flower seed mixes. Maybe someone else may have a different view, but I would certainly welcome it in my garden.
A gardener's work is never at an end - (John Evelyn 1620-1706)
Thank you; I googled and it does look like that! My daughter did bring home some wildflower seeds from a school thing just before lockdown, which she pressed inti the ground around April I suppose. I thought none had germinated but that's just lovely if it is that.
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Corn-cockles were once very common in the fields, but the use of herbicides means they are quite rare in the wild now, although are often included in wild flower seed mixes.
Maybe someone else may have a different view, but I would certainly welcome it in my garden.