Since 1952, the public has been able to request congratulatory messages from the British monarch for special occasions. The service is free of charge, and the card will be signed by The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, or The Countess of Wessex.
There is not a lot of information available on this topic. However, it appears that the queen sends out congratulatory cards for various occasions, such as births, weddings, anniversaries, and other special events. It is unclear how one would go about requesting a card from the queen, but it is likely that there is some sort of process in place.
The Queen's congratulatory service provides an excellent way to send congratulations to friends and family. By using the service, you can be sure that your card will be sent to the right person and that it will be of excellent quality.