Queen has become the first act to sell six million copies of an album in the UK - three decades after it was released.
The Queen received a plethora of presents during royal engagements in 2013 including a commemorative Oyster card.
The Queen used the wrong name for the Republic of Ireland when writing to president Patrick Hillery.
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."
The royal household's staffing levels have remained largely static at around 430 people, during the past seven years, to allow it to maintain the Queen's programme.
However this contrasted with the public sector which had seen employee numbers cut during the same period, and yet the sector was still expected to increase efficiency with fewer workers.
The Queen's royal household could do more to reduce its costs and increase income, and must get a firmer grip on a huge backlog of property repairs, a committee of MPs has said.
The household also needs to plan and manage its budget better for the long term, a report by the Public Accounts Committee (PAC) recommended.
The report produced by the PAC looked at the Sovereign Grant, the financial system funding the monarchy, and last October its MPs questioned Sir Alan Reid, Keeper of the Privy Purse, about the financial affairs of the household.
Queen star Brian May said he has found a forgotten "unfinished" track featuring the vocals of the late Freddie Mercury that the band recorded more than 30 years ago.
Writing on his blog, May said that the music still sounds "fresh" and hinted that it may be set for release, writing: "It's crying out to be finally brought into the world."
The guitarist, who also revealed that he has just been given the all-clear from cancer, confirmed that the track features himself, Mercury, drummer Roger Taylor and former bassist John Deacon.
"Some Queen magic is happening...I feel it in my bones," he wrote. "It's annoying to have to be so secretive, but I guess I have to, for now.
May said that hearing the track had made him "quite emotional" and said that as well as music, the recording features rough takes and "discussion and banter".
The Queen waved to the crowds after attending church this morning at Sandringham.
The Queen, wearing a purple coat and matching hat, travelled to the service by car while the Duke of Edinburgh and the Princess Royal led the way from the main house on foot.
Prince Harry, still sporting a beard from his exertions in the Arctic with the charity Walking With the Wounded, attended the Sandringham Christmas service alone despite rumours his girlfriend, Cressida Bonas, may join him.
Harry said he intended to keep his beard as it was a "Royal tradition".
William told the Sandringham crowd: "We've had a good morning with George and I can't wait until next year when he's bigger."
Cicely Howard, 75, from Great Yarmouth, met Kate and asked about the baby.
She said: "She told me he was having a lovely day but was more interested in the wrapping paper than the presents."