Matthew McSweeney, former chief of staff to Prime Minister Keir Starmer, has publicly acknowledged making a critical judgment error regarding Lord Mandelson's appointment. The admission comes amid mounting political pressure as Parliament prepares to vote on initiating a comprehensive inquiry into the government's vetting procedures. The controversy highlights serious questions about due diligence protocols within Number 10 and raises concerns about transparency in senior political appointments during the early stages of the Labour administration.

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