surely it's just an indication of what they would be entitled to
or rather, what
they think they would be entitled to.
If one gets divorced, one is entitled to a half share after the costs of separation are taken into account. I certainly hope that if Scotland goes its own way the Westminster government screws them over and does not roll over and be a soft touch. I personally dont care if the Scots vote YES, provided they pay the full costs of breaking down the Union - and also that we dont have any Scots in Westminster - that should keep Labour out of power for a generation!