In order to have any hope of being able to finely map out our migration patterns using genetics (and I actually doubt this is possible at all, we're just too similar) we have to have a massive, massive sample collection from all over the world. Kept in a single database, with a dedicated team chasing down patterns. At the moment that simply doesn't exist. But even if it did, I'm not sure you could get a clear picture of invasions/migrations from two groups as similar and in close contact as the Indigenous Brits and the Anglo-Saxons. Genetically, they're pretty much the same people. What distinguished them was their culture. Does that make sense?
Yes, that makes perfect sense, thanks. I see it is one heck of a challenge that may never be solved but an interesting one all the same.