There has been a Russian Church in London for about 300 years, After the Russian Revolution the Imperial Embassy Chapel was closed and a new home was sought for the parish. It became a diocese in 1929 when Archmandrite Nicholas Karpov was consecrated as Bishop of London and took up residence in the UK.In 1932 he reposed in the Lord whilst visiting the Synod of the Russian Orthodox Church Abroad (Karlovtsi Synod) in the then Kingdom of Serbia. The next bishop to reside in London and have oversight of the parishes in the United Kingdom was the ever-memorable Archbishop Nikodem (Nagaieff), who was bishop in London from 1954 until his death in 1976, at the age of 93. Initially, Bishop Nikodem was a suffragan bishop under the ompohor of Archbishop John (glorified in 1994 as Saint John of Shanghai and San Francisco) who, from 1953 to 1962, was Archbishop of Brussels and Western Europe. The next bishop to reside in London was Bishop Constantine (Jessensky) of blessed memory who retired in 1986. In the same year, Archbishop Mark was appointed as ruling hierarch for London and Great Britain. The Cathedral parish moved to its present location in Chiswick, West London, in 1990, having previously been at Emperor's Gate, London SW7. For a more detailed history see "Embassy, Emigrants, and Englishmen" by Fr Christopher Birchall, published by Holy Trinity Press, Jordanville in 2014.
The two parts of the Russian Church remained divided for many decades but came together in the Act of Canonical Communion in May 2007. ROCOR remains self governing with its own Synod of Bishops which normally meets in New York. Its First Hierarch is Metropolitan Hilarion. ROCOR has witnessed to the traditions it inherited from before the Russian Revolution. It has, and continues to have, a vibrant missionary spirit, and seeks to both support Russian Orthodox Christians outside Russia and to spread the Gospel of Christ to the peoples of a wide range of countries.