Blue Peter 1980-1981 Episode 54 Episode 54 ( Air Date 1981-03-16 ) Genre Family category. Overview "In two weeks' time, 7,500 athletes will be running in the London Marathon. At 26 miles, 385 yards, it's the longest race in the world. Sarah tells the story of how this greatest test of man's endurance began.".
Blue Peter 1980-1981 Episode 54 Episode 54
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