This month, we count heads with our experts - Carl Cullinane from Democratic Audit at LSE, Cecilia Lantana Briones (also from the LSE) and Duncan Smith from closer to home at CASA.

Carl Cullinane can be found on Twitter at @CullinaneCarl. Read the Democratic Audit blog at www.democraticaudit.com, and check out Democratic Dashboard at http://democraticdashboard.com.

This month was led by Thomas Oleron Evans (@mathistopheles), Oliver Marsh (@sidewaysScience) and Martin Zaltz Austwick (@sociablephysics)

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IMAGE: Bondegezou, https://commons.wikimedia.org/wiki/File:Polling_station_sign_Hamsptead_Heath_2015.jpg (Creative Commons)