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It remains one of the most frequently posed questions to television chat show presenters, and now Graham Norton has finally disclosed who ranks as his most challenging guest on The Graham Norton Show.

The host has invited major A-list celebrities onto his famous red sofa for more than 18 years, though not every encounter has proved delightful.

Enter Hollywood legend Mark Wahlberg. The acclaimed actor appeared on the BBC programme back in 2013 to publicise his film Broken City.

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Graham suspects the star was intoxicated, rendering the interview "hell."

Host Graham, 62, made these revelations whilst speaking at the Henley Literary Festival last Friday.

In a candid confession, he

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