A larger Wales, A larger Cornwall

What if the welsh had kept everything west of the river Severn and chestershire and if Cornwall had kept everything west of the river exe, surviving the Saxon period as independent as Wales?
 
All of this basically hinges, I think, on the Britons being able to hold the Severn Estuary (Gloucestershire, basically). Hold the Severn, and Cornwall and Wales will remain united, and relatively strong; lose it, and the West Country alone cannot really hope to hold back the English. Lose the Severn, and Wales loses one of its major natural defences, and as a result, will be forced into the Welsh hills. Of course, if that happens, I think that Wales and Cornwall are much less likely to divide, and they will probably never diverge as significantly as OTL.
 
Best way to get a larger Wales/Cornwall is victory at the Battle of Bath. If you want to get really ambitious then a victory at the Battle of Chester as well, which preserves the route to the Old North.
 
This would mean a radically shrunken Wessex, which would probably go the way of Kent and East Anglia as an independent member of the Heptarchy. So a Mercian or Northumbrian driven England would be the result. Which in turn probably means a more explicitly scandinavian England once the Vikings start coming. York or Tamworth could well be the capital of "England" in these circumstances. (London would still have the long term advantage in a stable country)

Sorry I'm NOT trying to combine two threads.
 
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