Listening to the Scottish independence campaign trail starting, I couldn't help wondering if David Cameron has done the arithmetic?
At the 2010 General Election, his party got just one Scottish seat leaving 58 won by other parties. If he lets Scotland go, he gains around 60 seats come the next General Election. That could mean an outright win and no annoying coalition partners. What's not to like?
Perhaps he has to pretend to want to stop the Scottish escape for some reason?