What happens if (when) Boris Johnson rejects a Section 30 order?

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The National
What happens if (when) Boris Johnson rejects a Section 30 order?

Nicola Sturgeon has revealed that she’ll be submitting a request for a Section 30 order to the UK Government within the next few weeks, taking the first step toward holding a second independence referendum in Scotland.

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The National
What happens if (when) Boris Johnson rejects a Section 30 order?