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Just how many languages can we have be spoken in the British Isles? The rule is that each language has to have a territory within the British Isles where most people speak it but that area can be as small as a county or parish, or be as large as any one of the Home Nations.
Here are some ideas to have there be more languages:
Have Norn, Cornish, Manx and Yola intact among the commoners until the industrial revolution
Have the English spoken in the enclave of Southern Pembrokeshire since the 12th century diverge into a separate language due to its isolation from England
Have different regional germanic languages exist within England. For example, have the vernacular of Nortumberland, for example, be as different from standard English as Yola is.