It was recorded when David Tennant and Catherine Tate were covering for Jonathan Ross on BBC Radio Two in January 2010.
On this show one of their guests was Ricky Gervais and this is the fourth part of their interview with him.
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The topics in this part of the interview with Ricky are "Ricky Gervais is still in the studio" / Pulling a sickie / The Invention Of Lying DVD / "I've got a blu-ray."
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