Lord Patten, the BBC Trust chairman, became embroiled in a spat with Conservative MP Philip Davies as he was grilled about his job at his appearance at the Commons Culture, Media and Sport Committee.
Asked by Mr Davies to supply a full itinerary of his daily work for the corporation, the peer refused, saying the question was "impertinent".
Lord Patten had been asked how many days he devoted to his job as chairman of the BBC Trust, saying: "At the moment about eight".
He said he spent three or four days a week on BBC premises, but probably more on BBC work outside that.
Pressed on the point later in the meeting, he was asked for an itinerary of his day by Mr Davies, to which he refused, saying: "I think it's a thoroughly impertinent question".
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