Given the distaste for smoke-filled rooms, let me make a more public opening bid. We can start with the coalition deal set out in my New Statesman piece calling for a Lab-Lib coalition back in January.
Labour has since adopted most of the constitutional positions set out there - though not yet full PR for local government.
However, it might be that there is a case for going further - for example, a referendum (this Autumn?) on AV+ and an elected Lords.
I suspect it is a hypothetical discussion. And the piece was calling for a coalition to be formed in response to the financial crisis ahead of the election, in part because it was sceptical as to whether any coalition (blue-yellow or red-yellow) would in the end result from a hung Parliament:
The Liberal Democrats could be expected to stand aside, just as they rejected all coalition options in Scotland and Wales last year ... A hung parliament would put David Cameron in Downing Street with a Tory minority government.