There are absolutely NO statistics to prove that the late promises, or "The Vow" persuaded people to vote No. Many who voted either way made their minds up months in advance of the polling date, and had posted their votes well before all the events of the final week, so could not be influenced by all that rhetoric. I think it was approx 20% of voters had a postal vote.
Sure, there was a poll (a sample, who's to say if it was representative?) showing a largish percentage of people were still undecided only a week or so before the vote. But there is still NO sound statistical proof that the activities of Cameron, Darling and Brown drove people into the No camp: one could equally argue that it was their activities, or the later speeches of Salmond and Sturgeon persuaded people to vote Yes.......or it might just have been down to whoever had the best sales pitch at the polling station. ("Every time Cameron opens his mouth, it's another yes vote" was a popular belief"!)

The whole campaign has been beset by false claims on both sides, and these now continue in the aftermath. And now they have the cheek to blame the over-65s No voters: we ALL have loose screws, lost marbles, advancing dementia, according to some sources.
It has been a wake-up call for Westminster, so let's keep up the pressure for change. And let's not lose friends over it.