Only one quibble: The Basque are not Celts, though they ARE related to the Gaels (Milesians) in Scotland and Ireland. These groups of people are genetically distinct from other 'Celtic' groups in Europe (all other groups, Celtic or not, in fact), though they were undoubtedly in contact with the Celtic world, whose culture spread just as readily as Rome's later would. Calling the Basque/Milesians 'Celtic' is a little similar to calling the English 'Roman', because you can find viaducts and Latin inscriptions in England. Genetics and linguistics have long since dispelled the myth that either were/are Celts.
Both the Basque and the Milesians are genetically related to Berbers, but genealogists have been unable to determine how they came to be geographically seperated or where they originally came from. Irish history is quite explicit about the Milesians coming from Iberia, and an Irishman could obtain Spanish citizenship up until the 19th century based on his historical connection. They claimed to have settled Iberia after their ruling Queen and her husband were exiled from both Greece and Egypt.
The Greek part isn't so surprising. Greece also had its own Milesian people, of the city of Miletus, where the pre-Socratic 'Milesian School' of philosophy emerged. Miletus is also the root of the word "military" and the Milesians were known as a martial people - the Scots have traditionally been placed on the frontlines of British military excursions, partly because they're expendable, but moreso because they're famous for being nutcases who'll happily start a fight with themselves.
The 'Gaelic' Milesians arrived in Ireland not long after the Peleponnesian War, having camped in Iberia/Spain for some years. Spain was home to many Greek colonies - "Es - Pan - a" derives from the God, Pan - so there's nothing controversial about this claim.
The conquest of Hibernia (Ireland) didn't occur until long after Skota's death. The chronology of the Irish poems suggests she lived at the same time as Akhenaten, so it's quite possible that she was either exiled during his reign for refusing to convert to Atenism, or was exiled after he was deposed for being an Atenist. Some attempts have been made to identify her as the daughter of Akhenaten and sister-wife to King Tut, who likely had to flee Egypt after the deposition/murder of her brother-lover.
The reason this is interesting is that the Egyptian pharoahs have been proven to have the same Berber/Milesian DNA as the Basque and the Gaels. Many had red hair (have seen this personally, having spent some time in Egypt - Ramses is a good example, but there are a few 'ginger' mummies in the Egyptian Museum).
Many Greeks consider the Scots to be related to the Macedonian's. I found this surprising, since I'd never heard this said in the UK, but it's a popular perception in Greece. This is probably because Macedonian traditional music and dress bears an uncanny similarity to Gaelic traditional music and dress. There are many other similarities, too numerous to list here. In any case, this would again be in the vicinity of old Miletus.
The structure of old Irish poetry bears a strong resemblance to Homeric poetry, and the bardic traditions in Ireland were strikingly similar to Greek traditions (Irish bards were arguably superior in terms of the volume of information they were able to retain). Read about the battles between the Milesians and the Tuatha and you might as well be reading the Illiad - it's the same shit (and was the inspiration of most of Tolkien's mythology to boot).
It could be that the major part of the 'Milesian' people, being of Berber descent, were expelled from Egypt, for reasons we can't be certain of, and joined up with the Greek exiles accompanying Skota's husband (who may even have been related to one another) eventually came to settle in Spain before moving to Ireland and then Scotland (which has the highest percentage of red heads in the world by far).
The Berbers were a white race, but have been mostly wiped out via genocide and mixing with mudslimes. White Berbers are still around, but are harder to find. What you're more likely to find is a red-headed Berber who also happens to be a proper shitskin - a weird sight if there ever was one, but you can also find blond Berbers if you try hard enough. They redheads are all over the place in the regions around the Atlas (founder of Atlantis) Mountains.