It has long been taught in the COGs that for centuries in the distant past the church in the British Isles was very much like the COGs until they were taken over by Catholics loyal to the Pope.
This idea may also be seen in LCG's writings as may be seen in Douglas Winnail's article "Early Christianity in Europe's Western Isles" (Tomorrow's World, November-December 2002.) However in that article it is insisted that the some of the original Apostles brought Christianity to the British Isles.
The widely accepted notion that Patrick first brought Christianity to Ireland is a fable—not a fact. Numerous historical sources state that the Apostles brought true Christianity to Ireland four centuries before Patrick!Armstrongism was started up by Herbert Armstrong when he joined the Church of God (Seventh Day) and split away from them to start up his own organization which taught his own ideas often cobbled together from other sources in a syncretic fashion, often from other Adventist sources and the Jehovah's Witnesses. To say it is a continuation of some early form of Christianity in the British Isles is nonsense.