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Some people reckon they always knew Jimmy Savile had a dark side, but most of us were shocked when he was eventually unmasked as a vile abuser of the vulnerable.

Now, we realise, Louis Theroux got closer to the truth than most in his 1999 profile When Louis Met Jimmy. His new documentary includes friends, family, colleagues and victims trying to work out what drove Savile, and how he got away with it.