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Common weed, with low-lying foliage (leaves toothed and sometimes furry). Flowers yellow and small and borne on tall stems
I've added a photo of the leaves, c.liberia. Not exactly the same as common winter-cress but very similar. Perhaps a different barbarea? I will look into it.
It's possible. I'll try to get a picture of the leaves before I update the ID (I did have a photo but deleted it by mistake!) Thanks.