Isotope Dot - What Does That Mean?

In kent, it's really obvious, whole families are moving over together. And then they're becoming part of communities that are already well established. When you then get further west, am so ye oxfordshire am and over into the thames valley, that seems to be mostly mals coming in from the continent. But there is also these really interesting hints in sot of the midlands and the thames Valley of people coming from west en britoin in quite high numbers.