The World Tonight - 21/01/2011

Andy Coulson resigns as the Prime Minister's spokesman. Why was David Cameron so loyal to him despite evidence of illegal phone-tapping in his time as News of the World editor? Is Tony Blair right to blame the French for the failure to get a second resolution at the UN before the Iraq war? Disciplinarian Chinese 'Tiger' Mothers are said to raise more successful children. Are they all like that ? With Robin Lustig.