SNP MP Callum McCaig caused a stir in the House of Commons today when, during Prime Minister's Questions, he laid out the dire financial situation of the UK and asked if they "could really afford to be an independent country".

McCaig pointed out that the UK had: "one of the worst performing currencies in the world, it has a trade deficit of £133 billion and a national debt approaching £1.7 trillion."

He went on to ask, in the context of Brexit, if Prime Minister Theresa May really thought the UK could survive as an independent country in that situation.

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The implication was clear: If the UK considers itself in a strong enough position to leave the EU, then the same financial arguments cannot be used against Scotland becoming an independent country, lest the Tories be accused of hypocrisy.