Pete - that’s really fascinating stuff, thanks for posting it. I lived in Mitcham for a few years and never knew about this… Here’s a place worth visiting if anyone is interested in medicinal plants, it’s the Chelsea Physic Garden, not far from Sloane Square
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Link] They have some very interesting specimens growing there, including ones clearly labelled as poisonous or otherwise inedible… They also have a nice cafe there, but it’s blimmin’ pricey!