2010: the Tories get 36.1% of the vote, Labour get 29.0%. Result: hung parliament
Even with over twice the margin in votes in 2010 (7.1%) as Labour had in 2005 (2.8%) the Tories had fewer seats (almost 100 less) and could not get a majority. That was due to the bias and it has been that way for decades. The BBC summarised this in a graph: even when the Tories got most votes and seats in 2010 Labour found it easier to win seats.

The only exception is 2015. In this election when Labour and the Tories were close in the vote pollsters were predicting they would get a similar number of seats. The reason is the SNP grabbing all but one of Labour’s normally safe Scottish seats. Which of course makes it no easier for the Tories as the SNP are strongly opposed to them and would have supported Labour if Labour had enough seats. As it was the Tories did far better than expected and so needed less votes per MP.







