Who voted for Boris in 2008? Where was Labour's vote strongest? This map from Factmint shows how votes were distributed across the wards that make up the city. The detail means that patterns of voting emerge: from the BNP votes in the Essex boroughs, through to the distribution of Green party votes in 2008. What does it tell us about how London will vote in 2012? Use the dropdown menu to see how first and second preferences compare - and how each party fared