If you would like to congratulate Princess Eugenie & Jack Brooksbank on the announcement they are expecting their 1st child, you can write to them at:
Duke of York's Office
Buckingham Palace
London SW1A 1AA
UNITED KINGDOM
Prince Andrew's office has always handled Princess Eugenie & Princess Beatrice's mail. We know Prince Andrew is supposed to be moving his office out of Buckingham Palace at some point. But, the royal website still lists this as his mailing address and we have still seen some mail sent from there this year.
We haven't seen many replies from Prince Andrew's office in the last few months. But, I expect they are just slow due to reduced staff & funding, and COVID.
How you style Eugenie & Jack on the envelope and letter is up to you and how formal you want to be. But some options are:
Envelope:
HRH Princess Eugenie & Mr. Brooksbank
Mr & Mrs. Brooksbank
Princess Eugenie & Jack Brooksbank
Dear Line:
Your Royal Highness & Mr. Brooksbank
Eugenie & Jack
Note: Pre-tradition, Eugenie dropped her father's "of York" territorial designation after her wedding. (Although you will see it used accidentally on occasion.)
For more on how to style the different UK Royals.
