British Prime Minister David Cameron (L) is given a guided tour by Bishop Desmond Tutu around Liliesleaf Farm, in Johannesburg, South Africa July 18, 2011. Cameron defended his handling on Monday of a corruption scandal around Rupert Murdoch's media empire which has swept away Britain's top police chief and raised questions about the prime minister's own future. REUTERS/Christopher Furlong/Pool (SOUTH AFRICA - Tags: POLITICS)