The leaves look like Campanula persicifolia but the flower buds look a bit too clustered to me. I wonder if it's a fasciated form? The cluster of buds looks more like C. glomerata but I think that has broader leaves.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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I live in west central Scotland - not where that photo is...
Seems like leaving it may have been a good idea 🤞
Thank you, and I'll report back.