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In page Courtesy titles in the United Kingdom:

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If a peer of one of the top three ranks of the peerage (a duke, a marquess or an earl) has more than one title, his eldest son – himself not a peer – may use one of his father's lesser titles "by courtesy". However, the father continues to be the substantive holder of the peerage title, and the son is using the title by courtesy only, unless issued a writ of acceleration.[citation needed] The eldest son of the eldest son of a duke or marquess may use a still lower title, if one exists. In legal documents, the courtesy title is implied, but not used directly – that is, the name of the person is given, followed by "commonly called [title]".