I'm a big fan of Scotland. 

One of my first jobs was working for the Scottish insurer Standard Life, which meant regular trips to their head office in beautiful Edinburgh.

Before that, as a child, we visited Scotland on holiday several times. 

Just last Easter I loaded the family (and dog) into a people carrier and drove more than 20 hours for a week exploring the Western Highlands and Isle of Skye. It's a truly incredible country.

Today we learned that Scottish First Minister Nicola Sturgeon is planning a second independence referendum.

The timing seems designed to give the Scottish people a choice between leaving the EU and applying for new EU membership as an independent country.

I don't have an axe to grind on this (what I recognise can be very emotive subject) either way.

But from a purely economic perspective, independence for Scotland seems like a foolish move.

The economic case for independence, when it was last made back in 2014, was shaky at best. Since then, the oil price has gone off a cliff; in fact, Brent Crude achieved a three month low today at a little over $50 a barrel. 

There's also the fact that Scotland exported £50bn to the rest of the UK in 2015 (the most recent year for which figures are available), compared to £12bn to the rest of the EU.

Scotland is better served economically as part of the UK than as part of the EU, it would seem.

But of course independence is about much more than economics. 

I suspect the announcement of this new independence referendum today - on the day MPs at Westminster are voting on the legislation which will allow the UK to trigger Article 50 and start the process of leaving the EU - is partially designed to demonstrate the Scottish parliament should have more of a say in Brexit negotiations.

What I can say with confidence is that a period of domestic political uncertainty looks set to take place. Investors should unexpect a higher than usual amount of volatility, in the short-term at least.