Was hired by the London Times to serve as a German correspondent. Because of his pro-Fascist persona, Philby was able to obtain information on the Nazis and passed it along to his Soviet contacts. He was invited to formal and private dinner with prominent Nazi officials and military figures, so his information was particularly valuable.

At the outbreak of war between Britain and Germany Philby was working with the British Expedentiary Force in France. British military officials recognized him as a noted war correspondent and were therefore comfortable with sharing information with him. Philby immediately passed this information on to Moscow.

After Germany defeated France, Philby returned to Britain. Despite his previous membership in the pro-Fascist Anglo-German Fellowship as well as his wife's communist past, Philby was brought into the British Secret Intelligence Service in 1941 (he was aided by is father, who contacted Sir Stewart Menzies, the head of SIS, directly. As part of the counterespionage division of SIS, he he coordinated information exchanges between MI6 agents and Sandor Rado Soviet spy ring in Switzerland, obtaining valuable military information for Britain. Also was aligned closely with the Special Operations Executive, an espionage network which worked with underground resistance forces fighting against Germany. His success in these areas gained him high praise within the British intelligence community.

At the outbreak of war between Britain and Germany Philby was working with the British Expedentiary Force in France. British military officials recognized him as a noted war correspondent and were therefore comfortable with sharing information with him. Philby immediately passed this information on to Moscow.