This definition appears very rarely
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Whether ancient ('plea roll') or modern ('platform for internet content selection'), each page contains a wealth of information as well as definitions; for example, the entry for the House of Lords Record Office tells us that it contains over 1.
Mrs Hague's research has involved extensive trawls through the archives at the House of Lords Record Office.
I know this because an acquaintance rang up the House of Lords Record Office (no less) and was informed that most of Habeas Corpus had been repealed and that it was irrelevant anyway.