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Inspired by this site, who draws parallels between the fortunes of the Britons and the Byzantines and paints both as successors of the Roman Empire. I know. Constantinople eventually switched to Greek and Britain really never spoke Latin.
I don't know exactly how likely is this (probably very little), but how could things be different in the development of British culture and national consciousness, if when William the Conqueror lands, at least Wales speaks a Latin-derived language?