Scotland needs the security of being part of the United Kingdom to best protect itself from organised crime, economic shocks and terrorism, according to the Deputy Prime Minister.
Nick Clegg will set out "the positive economic case for Scotland remaining in the United Kingdom and the European Union" in a speech to the Scottish Chambers of Commerce in Edinburgh tomorrow.
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In Berwick-upon-Tweed - the town at the northern-most tip of England - history has taught them that no border necessarily lasts forever.
His car was about to get towed away. But he had other ideas.
Our experts take a look at the key issues that would face Scotland and the rest of the UK if Scots vote for independence.