So who is that star of the Fallout Amazon drama braving a post-apocalyptic Californian wasteland with a perfect American accent? It's Ella Purnell from London's Bethnal Green!

The 27-year-old displays such a flawless US accent on the series - as she has in previous shows such as the plane-crash drama Yellowjackets - that Americans were convinced she was one of their own.

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