My right hon. Friend rightly points out that we have a timetable of up to two years for the negotiations, and it is possible that the details will not be finalised until close to the end of that period. He is also entirely right to suggest that those in Scotland who talk about having a second referendum should remember what the right hon. Member for Gordon said: it was a once in a generation vote that took place in September 2014. It seems that a generation is now less than three years.