https://en.wikipedia.org/wiki/Russian_Orthodox_Diocese_of_Sourozh I know that OTL England only got a Russian Orthodox diocese in 1964, but ITTL I could see Sourozh or another vacant bishopric given to represent Russian Orthodox in England, to the point that perhaps in Russia, the isle of England becomes known as "Sourozh" or something like that. Love the map, love the idea! EDIT: Maybe have the Patriarch of Russia or the Patriarch of Constantinople offer to grant Henry VIII a divorce if he converted into Orthodoxy, and thus he and England converts to it. Then, a line of marriages occur between the growing English Empire and the Russian Empire, ultimately resulting in an alliance and later a union to ensure that perhaps a resurgent Catholic (or even a bizzaro form of Protestant [Draka or South African style Calvinism?] that is hyper militaristic and expansionist) doesn't overtake them.