Why are we told the UK is a ‘nation’ or a ‘country’, when it is neither?

Source::
The National
Why are we told the UK is a ‘nation’ or a ‘country’, when it is neither?

YESTERDAY morning on Radio Scotland a woman taking part in the discussion regarding the Tory leadership contest (sorry, I didn’t get the name) made reference to “the nation” repeatedly. Ruth Davidson has described herself as a “one-nation Tory” and the would-be LibDem leader Jo Swinson has repeatedly said she could not work with those who want to break up the UK.

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The National
Why are we told the UK is a ‘nation’ or a ‘country’, when it is neither?