World at One - 08/04/2009

National and international news with Martha Kearney. Including reports on the Independent Police Complaints Commission's plans to investigate the video footage that has emerged showing a man's encounter with police minutes before he collapsed and died of a heart attack at the G20 protests in London. Martha hears from a witness who attended to Mr Tomlinson after he collapsed, and a former Scotland Yard officer says there should be a criminal investigation. As Gordon Brown says he wants the UK to become a world leader in producing electric cars, London's mayor Boris Johnson gives his view on whether the UK's cities are ready to go electric. And should universities decide to grant places on the basis of the new A-star grade? The government says not yet, and the former chief inspector of schools offers his expert opinion.