(JPR) found that among British Muslims, 77% were Sunni, 5% were Shia, 1% were Ahmadiyya, and 4% were members of other denominations. 14% of British Muslims said they did not know or refused to answer the survey. The denominational or theme breakdown of mosques and prayer rooms in the UK in 2017 with a sum total of more than 5% were as follows: 41.2% Deobandi, 23.7% Barelvi, 9.4% Salafi, and 5.9% Shia (Twelver, Bohra, Ismaili). 7.4% were non-denominational prayer rooms. Sunni In 2015, The Economist stated that were 2.3 million Sunnis in the UK. Among British Sunnis in 2017, 66.7% were just non-denominational Sunni, 5.9% were Barelvi, 5.0% were Salafis, 4.1% were Deobandi, and 18.3% adhered to another Sunni Islam denomination. The majority of British mosques are Sunni, including Deobandi, Barelvis and Salafi. In 2010 the affiliation of the mosques was: 44.6% Deobandi, 28.2% Barelvi and other Sufi, 5.8% Salafi, 2.8% Maudoodi-inspired; of the remainder many were part of other Sunni traditions or unaffiliated, while 4.2% were Shi'a (4%). The majority of mosque managers are of Pakistani and Bangladeshi origin, with many Gujarati, and fewer Arab, Turkish and Somali managed entities. Shia In 2015, The Economist stated that were 400,000 Shias in the UK. Shia mosques are usually Twelvers but also cater for Zaydis and the 50,000-strong Ismaili community; they usually include facilities for women. Various Shia mosques include the Husseini Islamic Centre in Stanmore, Harrow which acts as one of the main Shia Muslim mosques in Britain as well as Masjid-e-Ali in Luton, one of the largest Imam Bargah/community centres in the UK. Others include Al Masjid ul Husseini in Northolt, Ealing, and Imam Khoei Islamic Centre in Queens Park, Brent. Across the country Manchester, Birmingham and London have the most Shia residents. Ahmadiyya The Ahmadiyya Muslim Community (AMC) established itself in the UK in 1912 and is thus the longest-standing Muslim community in the UK. The UK and worldwide headquarters of the AMC are currently situated on the grounds of 'The Blessed Mosque' (Masjid Mubarak), inaugurated on 17 May 2019 by Mirza Masroor Ahmad, the fifth caliph of the Ahmadiyya movement, in Tilford, Surrey. The AMC also has the largest Muslim youth organisation, the Ahmadiyya Muslim Youth Association (Majlis Khuddamul Ahmadiyya) in the UK (membership of 7,500) and the largest Muslim women's organisation, the Ahmadiyya Muslim Women's Association (), in the UK (membership of 10,000). Sectarian relations There