The "Agatha Christie indult" is a nickname applied to the permission granted in 1971 by Pope Paul VI for the use of the Tridentine Mass in England and Wales. "Indult" is a term from Catholic canon law referring to a permission to do something that would otherwise be forbidden. On 5 November 1971, the Pope granted the request. Between then and the granting of the worldwide "universal indult" in 1984, the bishops of England and Wales were authorized to grant permission for the occasional celebration of Mass in the old form, with the modifications introduced in 1965 and 1967.