Looks Celtic, yes?
I thought the same thing.
Roman rule in Britain was (despite the modern anachronistic, inaccurate, nationalistic myths) largely peaceful, prosperous, and uneventful. Adoption of Roman ways was creeping in even before the conquest under Emperor Claudius, and the first Romano-British villas seem to have appeared during the 1st c AD, iow, within a few decades, and an even shorter time after Boudicca's rebellion was obliterated. One problem that arose centuries later was that the locals had no experience, tradition, or even much interest in, the kinds of self-defense skills and local self-governance that might have come in handy in the face of Angle, Saxon, and Jute invasions, and not much later, the Danes and other Scandinavians.