Every year, the Anniversaries Office at Buckingham Palace sends out many thousands of birthday and wedding anniversary cards on behalf of HM The King. These help celebrate significant occasions, someone’s 100th, 105th and subsequent birthdays or their diamond (60th), 65th, platinum (70th) anniversaries and every year afterwards.
To make sure that a message is sent, a friend or relation needs to make an application well in advance of the special day. For both birthdays and wedding anniversaries, follow the link below and either apply online or download a copy of the form, complete it and return it by post:
https://www.royal.uk/anniversary-messages-0