Well, that may be an important distinction.
As is obviously evidenced by the title of his work, the Rev. Dr. J.A. Wylie is not primarily concerned with "The Fall of Orthodox England", but rather with "The History of the Scottish Nation".
Wylie actually spends very little time at all on the development of Orthodox Christianity amongst the Anglo-Saxons; his concern is almost-entirely focused upon the Celts of Scotia Major and Scotia Minor (Ireland and Scotland) and the Rock of Iona which formed a central monastic nexus between the two Scotias.
Wylie quotes numerous and extensive Patristic Quotations proving the existence of an ancient Strong-Predestinarian Tradition amongst the Orthodox Celts (albeit Greek-origin in Liturgy and Ecclesiology). He devotes nowhere near such consideration to the development of Christianity amongst the Anglo-Saxons.
Why? Because to Wylie, the Anglo-Saxons were a Pagan Invader who cut off the Orthodox Celts from Roman Christendom for over 200 years. He's not particularly concerned with the LATER evangelization of the Anglo-Saxons; he's primarily concerned with the isolated development of the Celtic Scots -- "THE HISTORY OF THE SCOTTISH NATION"; or as the Venerable Bede has explained: "beyond the reach of the decrees of synods, . . . they could learn only those thing contained in the writings of the Prophets, the Evangelists, and the Apostles."