There is no doubt that investigative journalism can produce some of the most impactful reporting. But in these digital and post-truth times, journalists today face significant challenges to exposing power and reporting the truth.

In this week's podcast, we speak to an investigative journalist with more than 40 years of experience in the field. Former Guardian and Observer journalist David Leigh reflects on his new book Investigative Journalism: A Survival Guide.

Using lessons from his heyday, whose reporting on a British cabinet minister ultimately lead to his arrest, Leigh offers some words of wisdom to journalists of the future on the dangers that await them.

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