United Kingdom
The Queen
Prince of Wales and Duchess of Cornwall
The Duchess of Cornwall
The Duke and Duchess of Cambridge
The Duke and Duchess of Sussex
The Yorks
Sarah, Duchess of York
The Princess Royal
The Earl and Countess of Wessex
Princess Alexandra
The 12th Duke and Duchess of Marlborough
The 9th Duke and Duchess of Wellington
The 7th Duke of Westminster
The 18th Duke and Duchess of Norfolk
The 11th Duke and Duchess of Richmond, 11th of Gordon, 6th of Lennox
The 4th Duke and Duchess of Fife
The 7th Marquess and Marchioness of Cholmondeley
The 11th Earl and Countess of Sandwich
The 9th Earl and Countess of Spencer
The 8th Earl and Countess of Carnarvon
Luke and Julie Montagu, Viscount and Viscountess Hinchingbrooke
Belgium
The King and Queen and Family
King Albert II and Queen Paola of Belgium
Princess Astrid and Prince Lorenz
Prince Amedeo and Princess Elisabetta
Prince Laurent and Princess Claire
Princess Marie-Esmeralda
Simeon and Anna de Merode
Bulgaria
Tsar and Tsaritsa of Bulgaria
Denmark
The Queen
The Crown Prince and Crown Princess
Prince Joachim and Princess Marie
France
The President of France
The Count and Countess of Paris
The Duke and Duchess d’Anjou
The 17th Duke and Duchess d’Uzès
Germany
The Duke of Bavaria
The Duke and Duchess in Bavaria
The Prince and Princess de Lippe
Traute, The Dowager Princess de Lippe
The Hereditary Couple of Hanover
The Prince and Princess of Isenburg
The Duke and Duchess of Mecklenburg
The Prince and Princess of Prussia
The Prince and Princess of Sayn-Wittgenstein-Sayn
Karl Eugen and Andrea von Neipperg
Hans Casper and Elisabeth, Graf and Gräfin zu Toerring Jettenbach
Ignaz and Robina, Graf and Gräfin zu Toerring Jettenbach
The Duke and Duchess of Wurttemberg
Greece
The King and Queen of Greece
The Crown Prince and Crown Princess
Italy
The Prince and Princess of Venice
The Prince and Princess of Naples
The Duke and Duchess of Aosta
Iran (New Year)
The Empress of Iran
Ireland
The President of Ireland
John and Xenia Brabazon, The 15th Earl and Countess of Meath
Anthony and Fionnuala Brabazon, Lord and Lady Ardee
Liechtenstein
The Prince of Liechtenstein
The Hereditary Prince and Princess
Luxembourg
The Grand Duke and Grand Duchess
The Hereditary Couple
Prince Felix and Princess Claire
Prince Louis
Princess Alexandra
Prince Sebastien
Tessy de Antony de Nassau and Frank Floessel
Xavier Bettel (Prime Minister of Luxembourg)
Archduke Imre and Archduchess Kathleen of Austria
Monaco
The Prince and Princess of Monaco
Princess Stephanie
Princess Caroline
the Netherlands
The King and Queen
Norway
The King and Queen
The Crown Couple
Portugal
The President of Portugal
Romania
Margareta, The Custodian of the Crown and Prince Radu of Romania
Serbia
The Crown Prince and Crown Princess
Prince Philip and Princess Danica
Spain
The King and Queen
King Juan Carlos and Queen Sofia
Duke of Alba
Sweden
The King and Queen of Sweden
The Crown Princess and Prince Daniel
Prince Carl Philip and Princess Sofia
Vatican
The Pope
Pope Benedict XVI
RoyalResponses 
How do you choose which Duke, Duchesesses, Marquesses and Marchionesses you will write too. Do you tend to stick to the same ones or do you try to switch it up every year based on who does and does not respond?
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basically I do research and just give it a try, some wont reply and some might reply to some and not others, its pure luck really. Stamps aren’t cheap so I just try a few at a time.
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