In the 1927 film The General, comedic legend Buster Keaton is running beside a train that's going at full speed. He tries to grab hold as it speeds past and barely manages to hang on to the caboose.
These days, Andrew Jackson says he feels an affinity with Keaton. This feeling stems out of his recent transition from managing director of wildlife specialist prodco Tigress Productions, to head of the BBC's Natural History Unit (NHU).

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