In this scenario, OTL Scotland goes Norse, with West Old Norse becoming the dominant language of not just Orkney, Shetland but the whole of the mainland as well as the Hebrides. And I mean for real, with no Anglicization in the High Middle Ages or later. What would this alternate Scotland be called?
The Gaels, in exchange for not having Northern Britain, get the whole of Wales and all of OTL England west of the river Severn. Wales therefore becomes known as Scotland and speaks a Goidelic language.
The Cornish however rule up to the river Exe.
So to sum up, the Gaels hold not just Ireland and the isle of Mann but Wales and England west of the Severn. The Norse get the whole of Scotland while the Britons only have Brittany, Cornwall and most of Devon.
The Gaels, in exchange for not having Northern Britain, get the whole of Wales and all of OTL England west of the river Severn. Wales therefore becomes known as Scotland and speaks a Goidelic language.
The Cornish however rule up to the river Exe.
So to sum up, the Gaels hold not just Ireland and the isle of Mann but Wales and England west of the Severn. The Norse get the whole of Scotland while the Britons only have Brittany, Cornwall and most of Devon.