I have the W3 mtDNA, and apparently "W" in general is most strongly associated wth indo-europeans of all the mtDNA haplogroups. It's the equivalent of R1a/b on the mtDNA side.

I took the Living DNA test and it doesn't tell me which particular subclade of W3 I belong to. Apparently, some W3 were found among Germanic and Yamnaya skeletons, so maybe it is associated with those.

Is there any site I can put my Living DNA mtDNA snp's in to see the specific subclade? I have tried the dna.jameslick(dotcom) (can't post links yet :P) but it doesn't show further than W3. Maybe Living DNA doesn't check the W mtDNA too deep at the moment?