On 24/10/15 08:04, J. P. Gilliver (John) wrote: > by limiting its focus > to those whose grandparents were all born within 80 km of each other, it > is obviously biased to immobility. I felt that the criteria were rather lax. I could manage all 4 grandparents, indeed all 8 ggparents born with 8km. Rather than rely in the Telegraph's report here are the links back to research: http://www.peopleofthebritishisles.org/ http://www.peopleofthebritishisles.org/nl6.pdf http://www.nature.com/nature/journal/v519/n7543/full/nature14230.html and http://www.nature.com/nature/journal/v519/n7543/extref/nature14230-s1.pdf The paper seems to be somewhat misnamed as it extends to N Ireland. OTOH if this is its full scope the project is also misnamed as the paper omits the bulk of Ireland. From an ecological point of view the most striking thing is that the map divides between the lowland & highland zones of Britain. The lowland zone is somewhat homgenous and the highland zone is subdivided into a number of geographically distinct clusters. The authors see these clusters as originating largely in pre-Roman population divisions, a possible break-down of these in the area of Roman occupation and then a superimposition of AngloSaxon settlement. I think relative ease of communication in the lowland zone vs the highland zone may be another factor. This goes a long way to explaining one facet of genealogy. There seem to be a lot of genealogists who consider it feasible that everybody in Britain/UK/whatever are descended from Edward II/Edward III/Carlemagne/whoever whilst to others it seems completely infeasible. -- Hotmail is my spam bin. Real address is ianng at austonley org uk