Found at the edge of woodland adjacent to Bryngarw House; likely to have been planted to add colour to the area.
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...heard anyone actually call this plant "Sowbread"?
It's one of those so-called common names that I have not once heard being used!
The one that flowers in spring (as I am sure you all know) is Cyclamen coum.
Interesting fact: Cyclamen hederifolium tubers root from the sides and the top, whereas C. coum (and the houseplant, C. persicum) root from the bottom of the tuber. Not that I am suggesting you dig it up to confirm the ID...
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
I haven't, but then I didn't even know it existed until I saw it.
Thanks for the interesting differentiators; I don't think I would be popular if I did confirm it in that way ;-)
Lat/Lng: 51.5524, -3.5785
OS grid ref: SS906849