That's not actually that troubling if you know yourself. It's much less than 10% of our GDP. Generall 60% is a crisis level. It's viewed as probably the maximum threshold for a developed countries deficits.

For the record Scotland's GDP is about 176 Billion a year.

It may interest you to learn this about the financial crisis:

In 2013, United States public debt-to-GDP ratio was 71.8%, according to the CIA World Factbook,[2] or 104.5%, according to the IMF including external debt.[3] The level of public debt in Japan 2013 was 243.2% of GDP, in China 22.4% and in India 66.7%, according to the IMF,[4] while the public debt-to-GDP ratio in 2013 was at 76.9% of GDP in Germany, 87.2% in the United Kingdom, 92.2% in France and 127.9% in Italy, according to Eurostat.[5]

Debt doesn't have to be a bad thing. It can speak of good investments that will pay dividends.

So you'll excuse me for not being troubled y the 15 billion deficit, though we can easily start to pay it down when we introduce more progressive taxation and have a basic societal safety net.