Welcome to Battleground 2015, showing the Top 40 Marginals of the 2015 General Election.

The map to your left shows the constituencies which previously held the smallest majorities in the country. Hovering on each reveals full details of how these most knife-edge of election battles resulted. They appear in order of their former vulnerability, from lowest majorities upwards. We have also added the outcomes of some other critical battles in white. By clicking on each constituency, you’ll be taken to our Results page where you’ll be able to browse the outcome of the election in greaterĀ detail.