AHC: Hen Ogledd, Strathclyde remain Briton-dominated.

How might one devise a scenario where most of Britain between the Firth of Forth and the Humber remain deminated by britons, speaking a language akin to Welsh, into the modern day. Do we have to find a way to strangle Northumbria in the cradle? Could it be an even later POD? Could this Briton-dominated central Britain unify, or would it remain disunited? Might we see four distinct regions emerge in the British Isles, one Anglo-Saxon, one Brythonic, one Gaelic, and one Pictish?
 
Well, that's an hard one.
Low population, on the highway of Irish Sea invasions, "benevolent" influence of Saxons and Albans...

First, you'll need probably to butterfly the union of Gaels and Picts in a first place, in order to prevent the Scottish takeover.

A Norse conquest could do it, transforming it as a Norse-Breton kingdom, akin to Norse Gael (maybe along what existed in Galloway then IOTL).
If keeping North Britain desunited, you could have a Welsh-like situation, meaning that a kingdom of England relativly unified could takeover slowly, making Strathclyde keeping some sort of self-identity as Wales at best, Cornwall at worst.
 
The North would have had better chances if the kingdoms weren't repeatedly subdivided and fighting among themselves.

The northern Britons neglected the formation of Bernicia at their peril. A British victory either at Caer Greu or the siege of Lindisfarne could still have been decisive.
 
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