On the day that the Pakistani President Asif Ali Zardari meets Prime Minister David Cameron, Richard Watson considers how secure Pakistan's nuclear weapons are - and whether the US might take pre-emptive steps to stop them falling into the hands of terrorists. We'll be joined by the Pakistani High Commissioner to Britain, Wajid Shamsul Hasan. Former IMF chief Dominique Strauss-Kahn has been released from house arrest amid doubts about the credibility of his accuser. We'll ask if he could still be a candidate for the French presidency - leading American lawyer Alan Dershowitz and DSK's biographer Michel Taubmann will discuss. And we're keeping a close eye on the tennis - is Andy Murray's dream of a Wimbledon final dying?