What is the Place of Custom in English Canon Law?

It is now generally recognised that as a matter of history the canon law was applied, subject to variations by local custom, in pre-Reformation England just as much as throughout the rest of Western Christendom. Indeed such local variations were permitted by the canon law itself. As Professor Brooke concluded in The English Church and The Papacy From The Conquest To The Reign of King John: “The English Church recognised the same law as the rest of the Church; it possessed and used the same collections of Church law that were employed in the rest of the Church. There is no shred of evidence to show that the English Church in the eleventh and twelfth centuries was governed by laws selected by itself.” The same was also true until the Reformation.