About 90% of Orthodox in the United Kingdom belong to the [[Greek Orthodox Archdiocese of Thyateira and Great Britain]] under the [[Ecumenical Patriarchate]], based in London, which has had a presence in England since at least the 17th century. Most of the clergy and faithful of that archdiocese are of Greek Cypriot origin, but about 30% of the clergy are non-Greek and serve mostly in English. Among the
parishes of the archdiocese are parishes of Russian tradition, derived mainly from post-World War II refugees from Poland.
The Ecumenical Patriarchate further has two other jurisdictions in the UK, the Ukrainians and the [[Episcopal Vicariate of Great Britain and Ireland]] (a part of the [[Patriarchal Exarchate for Orthodox Parishes of Russian Tradition in Western Europe]]), each of which have their own bishop.
The [[Church of Serbia]] is one of the other main jurisdictions in the UK.