Sayle searched through the rubbish left behind at the base and found documentary evidence, including a photograph and asthma prescriptions, that enabled Sayle to report that Che had left Cuba and was fomenting Communist insurrection in South America. Forty years later Sayle wrote for the first time about his Bolivian journey and the circumstances leading to Che's execution by the Bolivian army. He made headlines again in late 1967 when he tracked down British double agent, Kim Philby, in Moscow. After several days of staking out Moscow's foreign post office, he spotted Philby. Sayle recalled, "After a few days, I forget how many exactly, I saw a man looking like an intellectual of the 1930s, all leather patches on the elbows of his tweed jacket. I walked up to him and said, 'Mr Philby?'" He then secured the first and only interview of Philby after his 1963 defection. Sayle reported that he found Philby to be "a charming, entertaining man with a great sense of humor." Sayle also described Philby as a man with an "iron head" for drink who appeared to be enjoying his new life and who denied being a traitor. Philby told Sayle, "To betray, you must first belong. I never belonged." In August 1968, Sayle was sent to Prague to cover the Warsaw Pact invasion of Czechoslovakia. Fellow journalist Harold Jackson has written of Sayle's ingenuity in getting their stories out of the country. International telephone calls were blocked, and the Russians had seized the Prague telex exchange. Sayle and Jackson discovered that not all of the telex connections were blocked and spent 13 hours dialling "the 10,000 possibilities" to find a working telex code. After discovering several working exchanges, Jackson recalled that the enterprising Sayle sold the numbers to other journalists at "$100 a pop." Another obstacle facing the foreign press in Prague was a shortage of Czech crowns. Sayle took Jackson with him to the office of the Czech firm responsible for distribution of "The Times" in Czechoslovakia. Sayle claimed to be the publisher's personal representative and demanded that the man turn over funds that had not been remitted due to exchange restrictions. Jackson recalled, "We left the building with huge packs of Czech crowns stashed in a linen bag rustled up from some cupboard. They kept the foreign press corps functioning for weeks, no doubt at a suitable rate of exchange." In 1971, Sayle participated in the International Mount Everest Expedition and reporting on the expedition for BBC television.