Peter Kellner From YouGov In The Guardian.

http://www.theguardian.com/commentisfree/2014/nov/17/ukip-support-british-politics-voters-labour-party

A fascinating look at UKIP's progress through the analytical eye of Peter Kellner. Worthy of mention, however, is that as a general rule, it is Survation which has been most accurate to date on UKIP progress. If you wanna know what's going on though, take a look at this url!