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...under the general heading of "weed", so I'll be interested to see what IDs are suggested.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Could it be one of those trailing campanulas?
...I think that's what I was thinking of, yes. Hard to weed out, especially in rockeries.
Dorinicum? Errr, not sure, hard to tell the scale from a photo, but it looks a bit small...
... expanded at the base would make it Doronicum rather than Campanula.
some of the lower buds appear to have a yellow tinge.
Lat/Lng: 53.2591, -1.9148
OS grid ref: SK057735