Before the House of Lords Act 1999, which abolished the automatic right of hereditary peers to sit in the House of Lords, an heir apparent could be summoned to the Lords, before his parent's death, by a writ of acceleration – that is, by accelerating the inheritance of a junior title (usually a barony).
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The House of Lords Act 1999 removed the right of hereditary peers to sit in the House of Lords; so far Baron Gretton has not been one of the peers elected to be excepted from this either in the initial elections or any subsequent by elections.
In certain circumstances, such as for the House of Lords Act 1999, the consent of the Prince of Wales, in his capacity of Prince of Wales, Earl of Chester, or Prince and Great Steward of Scotland or as Duke of Cornwall, must also be obtained where a Bill affects his interests.