Cornish is, in every practical sense, a dead language - nobody speaks it as their mother-tongue. By all means study it, but I doubt it can, or should, be revived. I remember showing members of Mebyon Kernow around the Port of Par, and a pleasant lot they were - hardly campaigning types - although there was talk of reviving the Stannary Parliament at Lostwithiel.
The title 'Great' Britain is just to differentiate it from the other Britain, where they speak French and Breton. And the only people who are trying to weaken the UK are the Ukip MEPs who do nothing to further our interests. 'Traitors', if deluded ones, you might think.
UDI for the Isle of Dogs!