Looking increasingly certain to me now (as at late Tuesday afternoon) that it's a Tory/Lib-Dem coalition which is going to form the next UK Government ...
... so a 'probable' referendum on the Alternative Vote (AV - which is not a proportional voting system) within which the Tories will campaign vigorously AGAINST the adoption of AV;
... is being accepted over and above an immediate legislative guarantee of AV with a following referendum on a true PR system (possibly Single Transferable Vote - STV).
I wonder what Lib-Dem activists will make of that? ... there's really only one way to sum it up, and it's a phrase I suspect we will all be hearing increasingly over coming months:
Vote Lib-Dem get Tory.