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Smithsonian Channel UK Tuesday 12 October. Says it's first aired

" Breaking the sound Barrier "

8pm - 9pm. "In 1947, American pilot Chuck Yeager climbed into a bizarre experimental aircraft in an attempt to fly faster than the speed of sound. This is the story of the creation of the X-1 aircraft - from its seemingly impossible goal to its extraordinary accomplishment that made history and launched new generations of X planes. It is also the tale of Yeager's come-from-behind journey to break the sound barrier and lead a new generation of test pilots"

Original air date 7/2/2000, according to my TV guide - still, set to record :)