There's an epetition (or rather its been submitted for approval) on the Government petition website for a Referendum in England about leaving the United Kingdom.
Scotland is not a colony, it's a member of the UK, just like England. And England has exactly the same right to leave as Scotland. So let's forget about what the Scots want, and think instead about what the English want.
If England leaves the UK, the UK is no more, obviously. What the Scots then do is up to them, but the cash flow from Westminster stops, all English defence spending comes back to England etc etc.There's no more reason to sustain Scotland than there has been to sustain Ireland since its independence.
And, of course, if Scotland leaves the UK as the SNP is planning, they are unlikely to give a toss about what happens to England.
Wales could go independent as well, or unite with England IF the English consent to that in a referendum. I would for unity with Wales, but only on the strict understanding that the flow of English funds for Welsh extravagance ceases.