Yes to Fairer Votes?

Just a quick post, but the graphic below shows the fallacy of AV being a more proportional system, something that many will infer from its self-titled campaign of 'Yes to Fairer Votes'.

The graphs show the results of the 1997 general election in percentage of votes (left) and percentage of seats (right). On the right-hand graph, the lighter shades demonstrate the results under AV - Labour getting even more seats (nearly 70 per cent of all seats), and the Conservatives' 30 percent of the vote accounting for just 15 per cent of the seats, or 96 constituencies. Only the Lib Dems' seat share is more proportional - is it any wonder they are the only party united in favour of AV?

P.S. Calculations of what 1997 AV result would have been are from here.