The Scottish government has already said it would like the minimum voting age to be 16.

BBC: Scottish independence: Teaching union backs votes at 16

This is likely to involve allowing 16 and 17-year-olds to taking part, whereas the minimum voting age in UK elections is 18.

BBC: 'Lower the minimum voting age' for EU referendum

Much will depend on the mood among students a powerful force in a country where two-thirds of the population is under 30 and the minimum voting age is 15.

ECONOMIST: Showdown or backdown? | The