I Blame Communism
Banned
Again though with the talk of a powerful Scotland- IOTL Alba conquered the Lowlands and thereafter steadily became less and less Celtic until the Celts were seen as backwards foreigners living up in the hills with the Scotish rulers and most of the population being English speaking.
This is exagerration. It is true that the heart of power and influence moved gradually down to Edinburgh and the language of teh court became Germanic, but the Highlands weren't seen as "foreign", just having strange (Scottish) customs (on King George IV's visit, the Lowlanders were keen to hijack Scott's romantic protrayal of this "backward" part of the country: it was the actual Highlanders who objected). In any case, the langauge of the Lowlands was Scots, as evidenced by the hiring of "English teachers" and the creation of "Societies to promote the use of English in Scotland" in the 18th C.
This is OTL with Scotland just taking a small far northern chunk of England, if however you're to have them try and compete with England they would need to get the rest of Northumbria- considering that the northern chunk of Northumbria dominated Scotland given the whole lot of it you'd likely see more of a Kingdom of Northumbria ruling Scotland than the other way around despite how it started.
We had pretensions to Northumberland for some time, but this scenario doesn't require Scotland to be on anything like equal terms with England. We're just tipping the balance a bit more in Scotland's favour, giving it plenty of luck, and butterflying English supremacy on the seas in order to fulfil the challenge, a sbest we can, by allowing a Scottish conquest of Ireland.
And even with this they wouldn't be the equal of Southern England. They would have to put a lot of their national effort into defence.
Which assumes England invading every other weak. I think I'd strongly implied some continental entanglement or state catastrophe. Denmark, for comparison, is still there, despite having Germany underneath it.
As to Scotland going over to Ireland....ouch.
IOTL England had a hard enough time with that. A considerably smaller, poorer country is going to have an absolute nightmare trying the the same thing.
Of course, a considerable part of the "English" effort was in fact Scots, and the religious divide can be butterflied, which would help things enormously.
You would have to change Irish and British history from very early on, have Ulster keep its links with Scotland and the Kingdom of the Scots straddling the two islands. 'Civilizing' Ireland somehow a bit more during this time would also be a good idea (though how? Its well away from the continent and England was barbaric enough at the time...)
The vikings will also be a massive problem.
I see absolutely no compelling reason why it can't be accomplished later, allowing Scotland plenty of luck.
Yeah.
But they class the whole of Scotland as Celtic, with England though when they decide to class bits as Celtic they cut them off from England and class them totally different.
Really it should just be the Highlands in the Celtic nations.
Who are "they", and who classes anywhere in England as "totally differant". Anyway, "Celticness" isn't a linguistic identity. The vast majority of Irish people have English as their first language, but their national identity and culture is obviously Celtic. Similarly, in Scotland, there's a general feeling of "Celticness". The Highlands have never had a formal seperate existence until the unitary authorities.