Newsnight - 30/09/2010

Matt Prodger will ask if high frequency trading is making stock markets more efficient or putting economies in jeopardy. Richard Watson investigates claims made by Baroness Warsi that the Conservatives lost three seats at the last election because of electoral fraud. And Tim Whewell follows a former British civil servant as he returns to the part of Nigeria he was responsible for at the time of independence 50 years ago. John Smith - one of the few surviving members of the last generation of British colonial officers who ruled the country before independence in 1960 - describes what his life was like looking after 1,000 square miles of the country. Presented by Kirsty Wark.