UK energy secretary Chris Huhne defends his decision to attend the signing of BP’s controversial tie-up with Rosneft, Russia’s state-owned oil company. He describes to Elizabeth Rigby, chief political correspondent, the advantages he sees in the tie-up, which is being challenged by BP’s Russian billionaire partners, and the value of meeting Rosneft chairman and Russian energy tsar, Igor Sechin. Interview recorded on January 19 2011.