The Summer Science Exhibition is in progress at the Royal Society, and Brian Swann has posted a picture of one of the map details for the Forest of Dean area. I don't know what the blue triangles, etc. represent genetically (i.e. how they differ from Anglesey, Cornwall, etc.); but each symbol stands for the place of birth of one grandparent of some person who was sampled. You can just see the arrow going to the Forest of Dean at the bottom of this photo:

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