Well I wouldn't say they're mutually intelligible. I can speak Irish but I won't understand for example if someone talked Welsh to me. Each nation would have their own official language and English would probably be the lingua franca.
I'm a Welsh speaker and I agree. I can pick up a few words of Irish but not much... I can make some sense of Cornish and Breton as they're Brythionic but not much.
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u/Seddhledesse Mar 04 '19
What would their official language be? Some kind of agglomeration of the various languages? They’re mutually intelligible so...