The lessons of Clacton and Heywood: why UKIP will damage the Tories in 2015 but may ultimately harm Labour | Birkbeck Perspectives
http://blogs.bbk.ac.uk/bbkcomments/2014/10/10/the-lessons-of-clacton-and-heywood-why-ukip-will-damage-the-tories-in-2015-but-may-ultimately-harm-labour/