Diana, claimed that her scandalous conversations with James Gilbey (commonly referred to as the Squidgygate) were in fact recorded by the GCHQ, which intentionally released them on a "loop". People close to Diana believed the action was intended to defame her. Wharfe said Diana herself believed that members of the royal family were all being monitored, though he also stated that the main reason for it could be the potential threats of the IRA. Anniversaries, commemorations, and auctions On the first anniversary of Diana's death, people left flowers and bouquets outside the gates of Kensington Palace and a memorial service was held at Westminster Abbey. The royal family and the Prime Minister and his family went to Crathie Kirk for private prayers, while Diana's family held a private memorial service at Althorp. All flags at Buckingham Palace and other royal residences were flown at half-mast on the Queen's orders. The Union Jack was first lowered to half-mast on the day of Diana's funeral and has set a precedent, as based on the previous protocol no flag could ever fly at half-mast over the palace "even on the death of a monarch". Since 1997, however, the Union Flag (but not the Royal Standard) has flown at half-mast upon the deaths of members of the royal family, and other times of national mourning. The Concert for Diana at Wembley Stadium was held on 1 July 2007. The event, organised by the princes William and Harry, celebrated the 46th anniversary of their mother's birth and occurred a few weeks before the 10th anniversary of her death on 31 August. The proceeds from this event were donated to Diana's charities. On 31 August 2007, a service of thanksgiving for Diana took place in the Guards' Chapel. Among the 500 guests were members of the royal family and their relatives, members of the Spencer family, her godparents and godchildren, members of her wedding party, her close friends and aides, representatives from many of her charities, British politicians Gordon Brown, Tony Blair, and John Major, and friends from the entertainment world such as David Frost, Elton John, and Cliff Richard. On 19 March 2013, ten of Diana's dresses, including a midnight blue velvet gown she wore to a 1985 state dinner at the White House when she danced with John Travolta (which became known as the Travolta dress), raised over £800,000 at auction in London. In