Roman culture was taken on much more in the south east than it was in the north and west. In modern day Cornwall, northern England (and Scotland- mostly beyond Roman borders) and Wales the culture remained more closely aligned to native traditions.
In the south wealthy Britons, including vassal kings, built country villas and 'acted Roman' (see Tacitus' comment about culture and slavery) and in the increasingly sophisticated towns Roman style trade flourished.
It would be wrong to say that tribal identity disappeared. The Roman civitates were more strongly aligned to tribal groups in the south (usually more peaceful) than in the north. In the north a persistent military zone actively disrupted tribal areas (e.g. Hadrian's wall actually runs through Brigantine territory, not along its edge).
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