Though Labour-Tory coalitions are by no means unknown in local government, the article is all a little tongue in cheek. Still, we Lib Dems would do well to bear Kettle's conclusion in mind:
That does not sound so silly to me.
It seems innocent to assume that either Labour or the Tories would automatically turn first to the Liberal Democrats in those circumstances – or that the Lib Dems would necessarily deliver.
The big parties could calculate that they would be better off in a marriage of convenience with a historic enemy they respected, from which they could withdraw with dignity when the moment was right, rather than to embark on a more permanent entanglement with a Lib Dem party which at bottom they each despise.
Another interesting question is how the Liberal Democrats would react to such a development.
When Labour and the Tories work together in local government, we tend to be outraged. But if our favourite analysis that the other parties share a conservative view of the world and we are the true radicals is correct, isn't such a coalition at Westminster just what we should expect?