There's a very curious article on Reuters, which has a perfectly sound basic premise (that the UK is fast becoming Europe's most politically unstable country), but which is ruined by details that just don't make any sense. The author keeps using phrases like "almost certain" to refer to specific future scenarios that in reality are either highly unlikely or in some cases virtually impossible. For example...
"A Tory government supported by Scottish Nationalists and UKIP is a more plausible option. But the glue holding together such a coalition would be an EU referendum on membership terms that the rest of Europe would be extremely unlikely to accept."
Hmmm. 'Plausible' is not the first word that springs to mind, given that the SNP have explicitly ruled out any sort of deal with the Tories under any circumstances. And as for an in/out EU referendum being the "glue" of this impossible coalition, I'm not sure how we're supposed to square that notion with the SNP's absolute opposition to an in/out EU referendum.
"The Scottish National Party is sure to demand another Scottish independence referendum as its price for supporting a coalition"
That's not quite right - the real price would be a huge transfer of powers to the Scottish Parliament, including the unambiguous power to call a constitutional referendum at any time. That isn't the same thing as demanding that Westminster calls an independence referendum itself.
Nevertheless, this is a useful reminder of the multiple options that the SNP have at their disposal in the longer term. It's sometimes supposed that the biggest obstacle to a second referendum taking place (even well into the future) is that the PR voting system makes it murderously hard to cobble together an outright pro-independence majority in the Scottish Parliament. But if all else fails, there'll always be the Plan B of using coalition negotiations to seek a Westminster-initiated referendum, which in theory could even take place at a time when the SNP are not in power at Holyrood.
Not quite "heads I win, tails you lose", but it does mean that a second referendum will be much harder to thwart than certain unionists think.