Nigel some of your facts are a bit off there. The claim that there are less SNP MPs now than there were at the time of the independence referendum is just not so. At the time of said vote there were only 6 SNP MPs whereas there are now 35 SNP members. There are less now than there were after the 2015 election it is true but one has to remember that election result was spectacular beyond even Sturgeon's wildest dreams would have been. So they are down yes but from an incredibly high position. Had you told the SNP leadership in 2014 that just three years later they would not have 6 MPs but 36 then I imagine they would take that having more Scottish MPs than all the other parties put together.

Likewise in the Scottish Parliament people say they they no longer now have a majority - but remember they were never supposed to have a majority as the system was designed to make it very difficult to get a majority. They may be 6 MSPs down from where they were at the time of the Independence vote but their share of the vote and actual constituency votes received is both actually up from where it was then - and though they don't have a majority in the house they still have more MSPs than all four major UK wide unionist parties have combined.

Support for independence itself has remained basically just about where it was at the 2014 vote with recent polling showing only a fractional increase. That doesn't mean the SNP vote itself is guaranteed though as folk don't vote on one issue only. Labour are making a mini revival coming second in most polls now so there is the Corbyn effect to an extent. There are though a proportion of Labour voters who support independence too. So how the independence polls go in the future will depend on various things.

How people look at this Brexit process retrospectively is going to be a factor. And many Scots (not all) do feel that as a nation the country voted pretty overwhelmingly that it did not wish to leave the EU - and that not only are we leaving the EU but we may leave on a harder Brexit that the bulk of Scots would want. There is a feeling among many that as a nation the wishes are being ignored and that the sheer force of English numbers in parliament is dragging others where they don't want to go. There is also a bit of a feeling that whilst ignoring Scotland's wishes the UK gvt is falling over itself to try and accommodate Northern Ireland. Yet the vote against leaving the EU was considerably higher in Scotland than it was in Northern Ireland.