Thus Pope Pius IX issued the bull Universalis Ecclesiae of 29 September 1850 by which thirteen new dioceses were created.[8] The Ecclesiastical Titles Act had already been proposed by the British Parliament and was passed in 1851 as an anti-Catholic measure precisely to prevent any newly created Catholic dioceses from taking existing Anglican diocesan names, forbidding the wearing of (Anglican) clerical dress or setting bells in Catholic places of worship.However, under Pope Pius X, on 28 October 1911, the provinces of Liverpool and Birmingham were created, and Westminster retained as suffragan dioceses only Northampton, Nottingham, Portsmouth and Southwark.The diocese presently covers an area of 3,634 km2 (1,403 square miles) of the London boroughs north of the River Thames excluding Barking & Dagenham, Havering, Newham, Redbridge and Waltham Forest together with the districts of Staines-upon-Thames and Sunbury-on-Thames and the County of Hertfordshire.In global Catholicism, however, the last time there was an elected Catholic primate of England in Great Britain, accepted by the state, was prior to the Elizabethan phase of the Reformation.
The seat of the Archbishop of Westminster in 2024. The coat of arms of the incumbent Cardinal Vincent Nichols is placed above.