Don't get me started on this wretched referendum!
The Tories have completely shafted us by grudgingly allowing a vote on electoral reform, but only allowing a vote between the system that they want (FPTP) and the system that nobody wants (AV). One year ago, before the general election, AV was broadly slated during campaigning on electoral reform. The preferred system of most parties who'd like to see reform is the single transferable vote, but of course we can't have a referendum on that because it might actually get voted in. (Parties preferring STV: Greens, Lib Dems, Plaid Cymru, SNP, some Labour.)
So we're stuck with a referendum where a 'no to AV' vote will in effect be counted as a 'no to electoral reform' vote, and a 'yes to AV' vote means we will get AV, not the reform that was previously campaigned for.
I hear people saying that a move to AV could pave the way to further reform, but as far as I know this hasn't ever happened anywhere else in the world. If we vote in AV, we'll have AV for the next generation at least.