In fact, according to the Ashcroft Poll, the main reason for voting leave was so that "Laws affecting the UK should be made in the UK". That suggests a fairly firm grasp on sovereignty to me.
Also people have indicated that they would be prepared to take a financial hit in the short term as a price to pay for independence.
Ah the Ashcroft poll, my personal fave is "C'mon People (We're Making It Now)" with a nod to "Surprised by the Joy"
What say you Ash
'Seems that I was busy doing something close to nothing
But different than the day before'
'Met a dwarf that was no good, dressed like Little Red Riding Hood'
'Now you're unemployed, all non-void
Walkin' round like you're Pretty Boy Floyd'