The World Tonight - 29/03/2010

The Battle of the Chancellors - Alistair Darling, George Osborne and Vince Cable take part in a live TV debate explaining why they should be in charge of the economy Two suicide bombers kill 37 people and wound more than 70 others on the Moscow underground Four executives from the mining company Rio Tinto are jailed in China for taking bribes and stealing commercial secrets And mephedrone - until now one of the legal highs - is reclassified as a class B drug The World Tonight with Ritula Shah.