The UK's survival is now in doubt

Perhaps Scotland could get full autonomy over its own finances. Essentially, give the Scots everything they want except full independence.

And perhaps Britain could move to a fully federal system, meaning some form of English Parliament; senior Tories like Boris Johnson have said they are open to federalism.

Does that radical or dramatic? Yes, but these are extraordinary times: the most dramatic changes in the British constitution must surely be considered to avoid an even more dramatic and destructive outcome: Scottish independence.

And even if those dramatic measures are taken, there is no certainty of success. The breakup of Britain must now be considered a realistic possibility.