Interesting that you thought it might not be hardy, even down in the South-West. That's telling me it's probably not a fancy form of a British native. The foliage looks similar to Ammi but the ones I know are white and annual so that's not it (which reminds me, mine are past ready for planting out). And not carrot (Daucus) - that's very feathery in the leaf (my Daucus Black Knights need planting out too).
I'm stumped!!
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Where's that embarrassed face emoji when you need it.......
I live in west central Scotland - not where that photo is...
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.