The SNP stresses the economic importance of oil and gas but experts aren’t sure how much is out there or how much it’s worth
The Scottish economy has grown on the back of whisky, tourism and financial services but by far the biggest potential money-spinner comes from resources still in the ground: oil.
The North Sea has always been seen as crucial, not only to employment and tax revenues, but to the whole viability of Scotland as a thriving and independent nation state.