The DNA is basically the same on both sides of the dike. The Welsh just left the Franco-Iberian (Ice Age) refuge before the subsequent 18 other (traceable in the DNA) groups did. Same with the Irish and Scots. The Irish and Spanish are about 90% R1b as are 68% of all Europeans. The Norse/Danes (Vikings, etc) are R1a intruders who split from the R1 line about 25k years ago...they (R1a's) spent the Last Glacial Maximum in the Ukranian refuge northwest of the Black Sea while the R1b's huddled in Spain .
The Anglo-Saxons were just late arrival R1b's.
The R1's split from the R2's even earlier and I think the R2's may be the Jomon/Ainu/Emeshi/Lapita people that lead to the likes of Kennewick Man, Spirit Cave man, etc in the Americas...and, a mix of the Polynesians.(Clan Of Ina)
The Scottish Picts and the 'Black Irish' are just more early arrival R1b's.
Where do you get your information from in post 29? Is it a single source or gleaned from many?
Don’t you have sources for that or was it off the top of your head (#29)?