Really, you need to bone up on your history. The Church left Britain with the Legions, slowly returning a few centuries later.
Well, take up your beef with Sir Walter Scott and the long Arthurian tradition--which includes quite a few clergy. The church disappeared from Britain when the Pax Romana faded! Oh, my!
I guess I don't get to say any examples of this claim that Common Law is being used as some sort of argument to authority in theology?