This sounds somewhat similar to a just to be released book called UnRoman Britain by English archaeologists Stuart Laycock and Miles Russell. According to the book synopsis the Romans had very little impact on the British Isles as many of the 'Celtic' Britons and Picts refused to adopt any Roman culture beyond a few pots and trinkets here and there. According to the authors the feeling was mutual among the Romans, who never really came to accept Britannia as a "true" part of the Roman world.
It sounds a bit similar to the stuff I read in Francis Pryor's 'Britain AD' a few years back. Throughout that book Pryor referred to the Roman period as an 'interlude'; claiming the Romans never had much of a cultural impact on the native Britons. He uses examples of the majority of the Britons choosing to live in their little roundhouses rather than live in Roman towns.
Personally I doubt 'choice' had very little to do with it. Perhaps many Britons would have loved to live in a cosy Roman villa, but like many people in Britain today, they just could not afford to live the richman's lifestyle. Rich British noblemen like Togidubnus seem to have adopted the Roman way of life though. I also find it interesting that Welsh, which is descended from the Brittonic language, has over a quarter of its words in latin, while many post-Roman British warlords, kings and Princes continued to use latin inscriptions and Roman terms (such as civites) for centuries after the fall of Roman Britain. So much for no impact!