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often_irrelephant posted on r/agathachristie3w
It's not quite the same thing, but David Suchet did a show called "Travels with Agatha Christie" where he takes you through her first big round the world trip. I watched it on BritBox, but there may also be a book? https://www.amazon.com/Travels-Agatha-Christie-David-Suchet/dp/1408723921 He talks about himself and Poirot as well, and reads some excerpts.