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It does look more like Sanicle than Pignut, now I know what to look for.
It's always good to get a photo of the stem and basal leaves, too. On this one, that would have made the ID easy, as the two species are so very different. Looks like Sanicle, though, with the compact, tiny umbels.
My Flickr photos...
Lat/Lng: 54.7198, -1.2589
OS grid ref: NZ478363