The homegrown British Orthodox Church and Celtic Orthodox Church, although both minor, are also represented. Other denominations and groups include the Seventh-day Adventist Church, the Seventh Day Baptists, the Plymouth Brethren, and Newfrontiers. The first missionaries from the Church of Jesus Christ of Latter Day Saints to proselytise in the British Isles arrived in 1837. By 1900 as many as 100,000 converts had joined the faith, but most of these early members soon emigrated to the United States to join the main body of the church. From the 1950s emigration to the United States began to be discouraged and local congregations grew more rapidly. Today the church claims just over 186,000 members across the United Kingdom, in over 330 local congregations, known as 'wards' or 'branches'. The church also maintains two temples in England, the first opening in the London area in 1958, and the second completed in 1998 in Preston and known as the Preston England Temple. Preston is also the site of the first preaching by LDS missionaries in 1837, and is home to the oldest continually existing Latter Day Saint congregation anywhere in the world. Restored 1994–2000, the Gadfield Elm Chapel in Worcestershire is the oldest extant chapel of the LDS Church. Jehovah's Witnesses had 137,631 "publishers" (a term referring to members actively involved in preaching) in the United Kingdom in 2015. The Church of Christ, Scientist is also represented in the UK. The General Assembly of Unitarian and Free Christian Churches is the umbrella organisation for Unitarian, Free Christian and other liberal religious congregations in the United Kingdom. The Unitarian Christian Association was formed in 1991. There are an estimated 18,000 Christadelphians in the UK. Estimates in 2009 suggested a total of about 2.4 million Muslims over all the United Kingdom. According to Pew Forum on Religion and Public Life, the number of Muslims in Britain could be up to 3 million. The vast majority of Muslims in the United Kingdom live in England and Wales: of 1,591,126 Muslims recorded at the 2001 Census, 1,546,626 were living in England and Wales, where they form 3 per cent of the population; 42,557 were living in Scotland, forming 0.8 per cent of the population; and 1,943 were living in Northern Ireland. Between 2001 and 2009 the Muslim population increased roughly 10 times faster than the rest of society. Most Muslim immigrants to the United Kingdom came from former colonies.