Question: St James's Palace held the first playing of the wedding anthem of Princess Anne, and though no longer the the principle residence of the monarch, it is still the ceremonial meeting place of what group?

This is a list of residences occupied by the British royal family, noting the seasons of the year they are traditionally occupied.  Members of the Royal Family inhabit their range of residences across the United Kingdom.  Some are royal palaces, owned by the Crown and held in trust by the monarch; others are privately owned.  Balmoral Castle and Sandringham House have been inherited as private property for several generations.  Other royal palaces are no longer residences (e.g. the Palace of Westminster, the Palace of Whitehall).  Some remain in irregular use for royal occasions (such as Hillsborough Castle).  The Royal Palaces enjoy certain legal privileges: for example, there is an exemption from levying duty on alcoholic beverages sold in the bars at the Palace of Westminster and there are exemptions from Health and Safety legislation.  According to "Halsbury's Laws of England", it is not possible to arrest a person within the "verges" of a royal palace (though this assertion is contradicted by a memorandum by the Clerk of the House of Commons in respect of the Palace of Westminster), and when a royal palace is used as a residence (regardless of whether the monarch is actually living there at the time), judicial processes cannot be executed within that palace. <SEP> The Wedding anthem for Princess Anne, HWV 262, This is the day which the Lord hath made, is an anthem for vocal soloists, chorus and orchestra by George Frideric Handel.  It was written for the wedding of Anne, Princess Royal and Prince William of Orange and was first performed during their marriage at the French Chapel in St James's Palace, London, on 14 March 1734.  The music is set to English texts chosen from the biblical books of Psalms, Proverbs and Ecclesiasticus. <SEP> St James's Palace is the most senior royal palace in the United Kingdom.  Located in the City of Westminster, although no longer the principal residence of the monarch, it is the ceremonial meeting place of the Accession Council and the London residence of several members of the royal family. <SEP> Princess Anne's Battery is an artillery battery in the British Overseas Territory of Gibraltar.  It is located on Willis's Plateau at the northern end of the Upper Rock Nature Reserve, above Princess Caroline's Battery.  It was named after Anne, Princess Royal and Princess of Orange, the eldest daughter of George II.  However, its name is often confused with those of other batteries in the area.  In 1732, guns were first mounted on the battery, which also saw action during the Great Siege of Gibraltar.  Princess Anne's Battery was updated in the nineteenth and twentieth centuries, with the latter modernisation entailing the installation of four QF 5.25 inch guns with both anti-aircraft and coastal defence capabilities.  The battery was manned into the early 1980s, after which it was decommissioned.  The guns were refurbished in the early twenty-first century, and represent the world's only intact battery of 5.25 inch anti-aircraft guns.  Princess Anne's Battery is listed with the Gibraltar Heritage Trust.