Don’t believe that for a moment, you’ve just fallen the trap. In the UK all 4 countries ( Scotland, Wales, Northern Ireland and England use the £Sterling, Isle of Man uses the £ too but like the rest of the UK have banks which produce their own banknotes, after that it gets complex but let’s not go there.
We all speak English-of a sort anyway- which seems to suggest that is the principal of the UK.
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