During the recent referendum campaign, the point was often made that it was a "once-in-a-generation" opportunity or, for people of a certain age, "once-in-a-lifetime".

Some of us are old enough to remember the 1979 referendum when the majority of votes cast were in favour of a Scottish Parliament. However, that Scottish Parliament never happened because the number of Yes voters did not constitute at least 40% of those eligible to vote. That was the wrecking amendment inserted by Labour MP George Cunningham during the passage of the Scotland Act 1978.

As a result, the Scottish Parliament was strangled at birth and Scotland had to suffer nearly two decades of Tory Government before they got another opportunity to vote for a Scottish Parliament in the 1997 referendum.

Will there be a similar time gap before another referendum can be held on Scottish independence ?

The result of the referendum means independence is off the immediate agenda, but it would be naive to imagine the issue dead and buried. Many of the 45% who voted Yes see the result as a deferment, not a defeat, and will continue to campaign for independence.

There is ample evidence that a majority of the younger generation voted Yes and, with support for independence at an all-time high, the momentum is with the Yes side. A swing of only 5% would achieve a Yes victory and even some Unionists fear that it's only a matter of time before Scotland becomes independent.

But how long is a matter of time? In the aftermath of September 18, some commentators suggest the people of Scotland are fed up with the independence issue and need another referendum like a hole in the head. We are told voters have referendum fatigue and anyone who even mentions the possibility of another referendum will get short shrift.

It may come as a surprise, then, to learn the recent Ipsos MORI poll for STV revealed that, regardless of circumstances, 58% would support another referendum in the next five years and nearly two-thirds would support another referendum in the next decade.

There could be public support for a referendum even sooner. The same poll indicates 53% would back an independence referendum if a Tory Government is elected at next year's General Election. That figure would rise to 55% if there was a vote for the UK to leave the EU in 2017. Neither of those scenarios is impossible, especially when we look at the rise of UKIP in England and the fall in Labour support in Scotland.

If Labour's misfortunes continue and dissatisfaction in Scotland about Westminster's failure to deliver a fairer society grows, the SNP may be tempted to include in their 2016 manifesto a commitment to a fresh referendum. They could then claim a mandate if they won another overall majority in the Scottish Parliament.

The way the Unionist parties handle the report of Lord Smith's Commission is also crucial. Those No voters who were persuaded by The Vow that extensive new powers for the Scottish Parliament would be delivered will feel angry and let down if those powers do not materialise in the timescale promised. If what eventually emerges is something as insipid as the Calman proposals, it will almost certainly increase public demand for another referendum.

Sometimes people learn from experience, though that experience can be bitter. Many who voted No in the 1979 referendum changed their minds during 18 years of unpopular Tory policies such as the poll tax, which would never have seen the light of day if the Scottish Parliament had existed.

It was tragic that they had to wait 18 years before getting another chance to vote Yes.

History has a habit of repeating itself but, after this year's referendum, another chance may come sooner rather than later.