The first-past-the-post electoral system, congruent with an era of two-party dominance, and enabling clear choices and strong government, has fallen into increasing disrepute.

Since the high noon of two-party politics in 1951, when Labour and the Tories together polled fully 96.8 per cent of the vote, their share has fallen remorselessly, to just 67.6 per cent by 2005.

Turnout has also fallen sharply so that, even more starkly, the two major parties captured 79.2 per cent of the electorate in 1951, but barely half that in 2005 – an embarrassing 41.4 per cent. At the same time, exaggerated majorities have been a feature, very convenient Labour in 1966, 1997 and 2001 but disastrous from 1951 to 1964 and from1979 to 1992.

First-past-the-post is unfair, and the case for electoral reform is strong. But the fatal defect of PR is that power is sucked upwards to regional or national levels of party structures, with the single member constituency, such a cherished feature of British parliamentary democracy, abolished. It is also hugely complex with its own anomalies.

The Liberal Democrat PR favourite, Single Transferable Vote, with on average five MPs in each ‘multi-members seat’, would mean monster constituencies (some covering hundreds of square miles), so breaking the historic link of democratic accountability to the local electorate and preventing voters re-electing or sacking their MP.

List PR systems favour candidates approved by central or at best regional party machines, with local parties losing virtually all influence and candidates often parachuted in, as happens in France. The most proportional PR version of all is in Israel where there is a national list leaving governments in hock to the vagaries of tiny and often extreme parties.

The Additional Member system requires two classes of MPs, some constituency based, the others coming from lists: constitutional ‘free loaders’ without constituency responsibilities or voter accountability. The disreputable behaviour of many list members in Wales and Scotland has hardly been a good advertisement.

Under PR the ordinary voter would have less opportunity to determine the composition of the government because coalitions would become the norm rather than the exception. The political scientist Giovanni Sartori unashamedly argued that this was a good thing because coalitions make it difficult for the electorate to ‘pin down who is responsible for decisions’!

A far better option is the Alternative Vote under which voters are allowed to vote 1,2,3 etc if they wish, with bottom candidates dropping out and their subsequent preference votes allocated to those above until someone wins an overall majority.

The winner has to have more than 50 per cent of voter support; under a third of MPs currently do so. AV retains accountability through the single member seat and produces a better relationship between votes cast and seats won than the existing system.

So, the case for AV is:
• it is much fairer
• the single member seat would be retained
• there is less scope for ‘wasted’ votes as electors can express their first preferences which might encourage turnout
• there would be less geographic bias which sees either Labour or Tories under represented in regions where both still have significant support
• each MP would have to secure at least 50 per cent of the vote
• it is simple – a contrast with the unfathomable complexities and anomalies of PR options
• no boundary changes would be required
• it is also the only option the Commons has ever voted for (in 1931) because MPs are unlikely willingly to vote themselves out of their seats as would certainly be required for PR.

The likely general election outcome is not certain. The evidence suggests Lib Dem second preferences would break pretty evenly in the current political climate, so Tory opponents could not claim it as a pro-Labour device. As the Australian experience shows, the case for the AV is not that it would necessarily favour or disfavour any one party, but that it is a more democratic system.

There is one other important plus: because the AV is an adjustment to the current system, not – like PR – a wholesale change involving the abolition of parliamentary constituencies, there is no case for the referendum rightly promised over PR. Electors would hardly thank parliament for indulging in all the paraphernalia of a referendum which invited them to state whether they wanted to confine their vote to 1 – or have the option of voting 1, 2, 3.

First-past-the-posters in Labour can live with the AV. So can Labour’s fervent PR advocates. The Lib Dems wouldn’t champion it, but they probably wouldn’t oppose it and might even back its parliamentary passage.

Bringing it in would put Labour on the high ground of democratic reform, enabling us to project a politics which is genuinely pluralist and empowering in a way that is not excited by our existing, though worthy, plans.

There is now a window of opportunity for our government to bring about an historic reform before the next election. It may not come around again for a generation or more. It should be seized and legislation introduced in the next parliamentary session.