"The most common form of Address occurs at the beginning of every session in reply to the Queen's Speech. Other forms of Address are those requesting the Queen to make an Order in Council in the form of a draft laid before the House or praying the Queen to annul a negative instrument. There has been an Address for the exercise of the prerogative of mercy. There are also Addresses of condolence or congratulation to the Sovereign on family or public occasions. An Address may also be presented in response to a Royal Message, concerning for example the Civil List or the declaration of a State of Emergency." (Companion 2.23)
These addresses are presented either by Privy Counsellors or members of the Royal Household (Most, but not all Whips are members of the Royal Household - The Deputy Chief Whip in the Commons is the Treasurer of the Household; while the number three and four in the Government Whips Office in the Commons hold the position of Comptroller and Vice-Chamberlain. Government whips in the Lords are also members of the Royal Household.)
