My dna testing from ancestry.com says I am 76 percent British Isles, which is quite reasonable. What I'm wondering is, how far back does that go? Would that include Anglo-Saxon ancestry or Norman ancestry, or would that fall under "Central European"? Likewise, would that include Viking ancestry, or would that fall under "Scandinavian." Just curious if I'm pretty much "aboriginal" stock, or how later admixtures show up. Or is it not really possible to be so specific?