In a “poll of polls” conducted in autumn 2013, the average support for Yes was at 32%, with no at 49%. When accounting for undecided voters, this translated into to 39% for Yes, and 61% for No.

But in the most recent poll of polls, the difference has narrowed to four percentage points, with 48% polling Yes and 52% polling No. Early polls indicated a gender gap, with women more likely to be in favour of the union, but this gap appears to have closed in recent weeks.

For most of the campaign, polls suggested a strong lead for the No campaign – but that now appears to have narrowed significantly.

A poll published on September 7 by YouGov indicated that the Yes campaign had in fact pulled slightly ahead in the polls. A survey by pollster TNS BMRB, published late the next day, showed that both sides were polling at 41% for those definitely going to vote, with the rest of the electorate undecided.    Scottish Independence- A Beginner’s Guide