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I believe they are probably related to the bands of hunters that followed the ice around from Europe to North America, creating the Clovis culture. We know that modern humans have been in Europe for tens of thousands of years, yet the Indo-European speaking didn't arrive until around 5000 years ago. The Indo-Europeans didn't kill everyone, they just dominated enough that their language took over. The same thing almost happened when the Normans conquered England, English might have died out had not the Norman kings adopted it (while revising the language so that the majority of the words are french/latin in origin.)

Anyway, it appears that the Cllovis people were in the east coast at least 12,000 years ago, and their arrow heads and other technology resembled the technology of the people who lived at the same time in Iberia. There is evidence that the original people of Iberia and the British Isles are from a common culture as well, so the original Clovis people may have been Welsh! More accurately, there was probably a common culture in western Europe during the end of the last ice age, and it was that culture from which the Clovis people came.

Starting about 20,000 years ago the peak ice began to melt. By 14,000 years it'd mostly been melted down in the temperate zones Although there was a large residual mass in much of Canada, but nothing like the 2 mile high humdingers of the peak period.

As conditions improved hunter/gatherers could move away from the Western European refugia Northern Spain, just south of the mountains.

One of the first groups to leave are now believed to be the people we know as the Sa'ami. They moved due North up the coast, and crossed to America, and went South into North Africa, and in time, managed to leave behind their marker gene sequence among the Sakha/Yakuts (ancestral to the Japanese ruling clique who invaded in 560 AD and imposed Buddhism).

It's possible they took along a Welshman or two, but they'd had to have left the Refugia first.

I wonder what the climate was in the hilly country in Wales at that time. Might have been inopportune to bother settling there, and with few people in Western Europe, they couldn't go everywhere.

Also, there's this thing about the Younger Dryas popping up and ruining everything. Evidence is a residual population of Sa'ami actually "wintered over" 1500 years on the Arctic coast. At the same time, their cousins in America were pretty much wiped out.

That climate anomaly definitely kept Britain miserable until about 9500 years ago.