It is not surprising that the polls on Scottish independence are tightening…

There are some pollsters who believe nothing has changed since 2011. All the storm and blast, bluff and bluster about Scottish independence has had no impact at all. The settled will of the Scottish people remains settles: more power for Edinburgh but no to independence. Oddly YouGov’s Peter Kellner is one of these pollsters.

Oddly because, as the chart above shows, his own polling organisation’s reports show that the race is, as long expected, tightening. There is a small but definite drift to Yes. True, at its present rate it will not be enough to prevail come September. But it is quite possible that the drift towards a Yes vote will become stronger, not weaker, as the referendum day approaches.

You would expect it to say so. The Yes campaign enjoys many advantages, after all. It is united. It knows what it wishes to achieve. It can sell a vision for the future.