Feb 1st, 2011: After last year's Deepwater Horizon-caused oil spill in the Gulf of Mexico, BP has put its troubled Texas City refinery up for sale as part of a wholesale shake-up of its US refining and marketing business that will see the UK oil group divest half of its refining capacity in the country. Sylvia Pfeifer, energy editor, talks to Daniel Garrahan about whether the move signals a change in BP's US strategy.