North Sea oil and gas reserves (or more precisely the tax take from Scotland's share) are vital to the Scottish government's case for independence. Mr Salmond says earmarking a tenth of revenues - about £1bn a year - could form an oil fund similar to the one operated in Norway, creating a £30bn sovereign wealth pot over a generation. read more
Scotland’s population: about 5 million) for the chance to be governed by people with whom they share a deeper cultural affinity. Paradoxically, pro-independence Scots have argued that they will recapture some of the advantages of size by joining the European Union. read more