For the documentary, Sarah will be travelling with Dr Ulrike across Germany, to Coburg, Gotha and St Wendel to meet royal historians and archivists in a bid to find out what happened to Louise, who was forced to leave her two young sons behind after separating from husband Ernst III, Duke of Saxe-Coburg-Saalfield, due to the Principality of Lichtenberg assigning her new residence as St Wendel.
Sarah has previously help produce The Young Victoria, which starred Emily Blunt and Rupert Friend and has always been interested in her children's ancestors.
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