I watched the film and pinned my fingers to guess:
First, the protagonist of the double spy is not a genius. He's not even good enough to be an intelligent analyst. Otherwise, in 22 years, he actually only provided so little information and only helped KGB kill three traitors. The people in Cambridge Spies are not all good people, but they can provide drawings of the atomic bomb, making the Cold War a reality. Family origin is really important.
Second, the FBI's technology is indeed inferior to the CIA. They probably did use the T3 line instead of the ATM, because CIA spy satellites can already see the news in Baghdad's newspapers, and the FBI still uses the car to track the hero's dead drop location. They can't even install a bug. The bugs of the 1970s were all over Nixon, but the bugs of 2001 made noise? !
Three, the screenwriter of Spook (MI-5) is mentally retarded. They should learn the story, write Adam as a three-material spy and blow him up. You said that such an addicted field officer has played for many years at the poker table of the United States, anti-American, Russia, the Middle East, and MI-5, MI-6, and he is so good with his B. Character, it is strange not to become an N-material spy.
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