Ahem. now even I have to say this thesis isn't accurate. In my area are some ancient sites known to have been over-run by saxons. Wayland Smithy, a neothilic burial site, was regarded as a sacred site by the impressed saxon invaders marching down the Ridgeway, and the hill-fort at Barbury is so named because it was taken over by Bera, a saxon warlord. Further, just down the hill from that fort is a level plateau where a dark age battle took place between saxon invaders and romano-celtic defenders, who lost. The remains of this relatively minor set-to have been found. If you look at the map of wiltshire, there are plenty of saxon names given to sites, and we know the saxons were keen farmers as much as hated warriors. Well I would suggest Mr Pryor comes down to north wiltshire armed with an ordnance survey and read up on saxon place-names. He might see things differently.
I was attempting to encapsulate Pryor's thesis, and didn't intend to be overly lengthy. Personally, I think he's gone a little bit too far, maybe way too far. I don't think the displacement of language, and place-names can easily be explained by a gradual absorption of incoming Saxons. Here in the USA there are alot of Native American place-names and loan words in a stiuation where the entire aboriginal population was displaced. I think there is a need somewhere to believe that the post-roman invasions were amiable. Hey, I think Wayland Smithy might be a Saxon name! (Just kidding, but that a cool name!)