Observer Poll.

Ukip achieves record support as
Tories drop 3% in Observer/Opinium poll
The Conservatives have dropped 3% to 29% in the latest Observer/Opinium poll at the same time as Ukip have surged by the same amount to 13% - a record for the anti-EU party since Opinium surveys began in 2011.
While the Labour party increased its lead over the Tories by two points to 9%, it too fell, by just 1%, to 38%.
The Lib Dems were four points adrift of Ukip, though Nick Clegg's party was up 1% on a fortnight ago, at 9%.

The Ukip surge will worry the Tories in particular, as it appears to have had a direct effect on Conservative support.

http://www.guardian.co.uk/politics/2012/dec/01/tory-party-ukip-opinium-poll