Wherever they came from, prehistoric Indo-European Celtic cultures laid the foundations for the present-day population of the British Isles. Description from jowsey.com. I searched for this on bing.com/images
Genetic Map of Europe. If you have had your DNA analyzed, you have a good idea of the information on this map, though it is given by tribal or cultural group, and not haplo-group. Over time, the general direction of population movement was west.
Blood of the Irish: What DNA Tells Us About the Ancestry of People in Ireland
Scientists at Oxford University have found that modern Britain can be divided into 17 distinct genetic 'clans' (pictured) with the Welsh having the most DNA from the original settlers of the British Isles.