I'm told that the Foreign Office regularly receives requests and visits from the Chinese, wanting to hear more about the "Westminster model".

BBC: Why the world envies Mr Osborne

MPs of all parties, that Britain's legislature has grown less able to do what it is supposed to under the Westminster model and hold an over-mighty executive to account.

ECONOMIST: The constitution bites back

If the coalition works, voters may warm to the idea of power-sharing, and to the proportional voting systems that inevitably give rise to it. (A referendum on the alternative-vote electoral model, which the Lib Dems prefer over Westminster's first-past-the-post system, is part of the deal.) And the Lib Dems got all this despite flopping at the polls.

ECONOMIST: The new coalition government

The other model is to write down a list of the powers that would be kept by Westminster, and allow the Scottish parliament to do everything else.

ECONOMIST: Devolution