I thought at first that it was a type of spurge (euphorbia), but now l'm not so sure. Hopefully someone will recognise it, l will tag @Silver surfer for a possible id.
Reminds me a bit of Campanula medium or campanula persicifolia (can’t remember which is the correct name) ? They self seed so maybe your neighbour has some? They have pretty blue or white bell shaped flowers, sometimes known as Canterbury bells
If you have a garden and a library, you have everything you need.”—Marcus Tullius Cicero East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
I think campanula persicifolia too. There are a couple of flower buds on there so if you post another pic when they open, we might be able to give a more definite answer.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Hello Everyone, thank you so much - and how lovely! We have them appearing on each side of the garden! I'll post a picture with buds asap, and another when they open! Thanks again, really appreciate it!
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East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thank you, Everyone! You were right - beautiful and insect-friendly Canterbury Bells! XX