This is completely inaccurate. Do you know anything about English history? Everything from King Alfred forward disproves your supposition.
Cecil Sharp was still collecting independent oral tradition in England and Scotland in the 1920s. Shoot, the authors of this book were still collecting it in the 1980s. And John Jacob Niles was collecting oral tradition in the U.S. Southern mountains in the 30s and 40s, as was Richard Chase.
Sorry, you're just plain wrong here.
Tradition is not Oral tradition. I can't really tell anything from your link except for the title, "Customs and Ceremonies...Living Traditions." Oral tradition is not tradition or ceremony.
From Wikipedia:
Oral tradition or oral culture is a way of transmitting history, literature or law from one generation to the next in a civilization without a writing system. An example that combined aspects of oral literature and oral history, before eventually being set down in writing, is the Homeric epic poetry of the Iliad and the Odyssey. In a general sense, "oral tradition" refers to the transmission of cultural material through vocal utterance, and was long held to be a key descriptor of folklore (a criterion no longer rigidly held by all folklorists). As an academic discipline, it refers both to a method and the objects studied by the method. (The study of oral tradition is distinct from the academic discipline of oral history, which is the recording of personal memories and histories of those who experienced historical eras or events.)