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According to Wikipedia, that separation of Spanish and UK titles is due to happen another generation along:

"The current heir apparent to the Dukedom of Ciudad Rodrigo is the 10th Duke's eldest child, Arthur Wellesley, Earl of Mornington. Lord Mornington has fraternal twins, a first-born daughter, Lady Mae Madeleine Wellesley, and a second-born son, Arthur Darcy Wellesley, Viscount Wellesley. Lady Mae Madeleine is Lord Mornington's heir apparent to the Spanish dukedom as the eldest child, while Viscount Wellesley is the heir to the British dukedom as the eldest male, which could lead to a separation of these titles."