Margaret Hodge, the PAC's chairman, criticised the Treasury for failing to be more actively involved in reviewing the household's financial planning and management, including in the plans to maintain historical buildings.
A Treasury spokesman said: "The new arrangements established by the Sovereign Grant Act have made the royal finances more transparent than ever while providing the long term stability necessary for good planning.
The PAC's report has failed to properly account for these changes."
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The success of the No camp is mainly due to Tsipras convincing people a No vote will strengthen their hands in negotiations.