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It is worth noting of course that when the letter was written David Phillips was not the Labour leader nor was he a whip. Perhaps that accounts for his failure to recall the correspondence. If he had been there then maybe he would have responded to it.
All the evidence however is that Labour only became concerned with the Scrutiny Chairs when an opportunity presented itself to use them to undermine the Administration. If they had any interest in scrutiny then they would have come to meetings over the last three years and actually tried to influence the agenda. That they didn't, speaks volumes.