A large opportunity cost where an enormous amount of time and treasure in spent by all the numerous departments involved to divide the assets. A bonanza for consulants and 'task forces' who will be deployed for months if not years to push this forward.
yes, there'll be huge spending on city firms of lawyers and accountants trying to work out how to carve up complex, integrated things like air traffic control and the grid as well as much discussed matters like fisheries, oil and the national debt. New Porches and trebles all round, and let's not even think about the negotiators who self-identify with Scotland and whatever conflict of interest that might imply.
And vast amounts of time spent by politicians bickering, which may mean they can't get up to anything worse or may just mean the government can slide through whatever else it pleases without what passes for scrutiny.
Their most immediate problem still appears to be the planned 2015 election, which will give them plenty of scope for grandstanding.
The official view is here with an awful lot of ifs, buts and maybes.
The central 'toxic' conundrum is not easy to resolve- what role should Scottish MPs play in the UK process that negotiates separation with the Scottish government? Whatif their presence creates a Labour administration that would lose its majority when they leave, but which will gerrymander negotiations for whatever future electoral advantage it can get both north and south of the border. The MPs longterm interest (and that of the constituents they pretend to represent) lies with Scotland so it's hard for even non-Tories to see fairness and parity in Scottish votes counting twice and being represented on both sides of the negotiations. Or should they somehow be excluded/exclude themselves in which case they still help determine the majority party but otherwise Scottish votes for UK constituencies are all but meaningless during the biggest constitutional change of the era. Delaying the UK election won't alter that, merely use an older mandate which further excludes those of us not in Scotland from any involvement in the process at all. And, of course, Scottish MPs will be out of a job after 2016, which will also play some part in their thinking.
So there's plenty of scope for dodgy deals and jockeying for advantage amongst chaps who all went to school/Oxbridge together and who- like Danny- see possibilities in the upheaval but unlike him are looking out almost entirely for themselves.
... and then there's the house of lords...