You can organise a congratulatory message from The Queen for diamond (sixtieth), sixty-fifth and platinum (seventieth) weddings and every year thereafter
Print out the application form from Buckingham Palace’s website and return it to the Anniversaries Office, Buckingham Palace, London SW1A 1AA no sooner than three weeks before the date of the anniversary. You will need to send a copy of the marriage certificate.
For a small fee you can also arrange it by telephone and the General Register Office will verify the details without you needing to send a copy of the marriage certificate.
You can also get a congratulatory message from the Queen for your 100th birthday anniversary.