94 million, larger than the empire's 58 million Christian population. By the 1920s, the British Empire included roughly half of the world's Muslim population. More than 400,000 Muslim soldiers of the British Indian Army fought for Britain during World War I, where 62,060 were killed in action. Muslim soldiers of the British Indian Army later fought for Britain against the Nazis in World War II, where Muslim soldiers accounted for up to 40% of the 2.5 million troops serving the British Indian Army. David Lloyd George, British Prime Minister from 1916 to 1922, stated: "we are the greatest Mahomedan power in the world and one-fourth of the population of the British Empire is Mahomedan. There have been no more loyal adherents to the throne and no more effective and loyal supporters of the Empire in its hour of trial." This statement was later reiterated by Gandhi in 1920. Winston Churchill also stated in 1942: "We must not on any account break with the Moslems, who represent a hundred million people, and the main army elements on which we must rely for the immediate fighting." The Shah Jahan Mosque in Woking was the first purpose-built mosque in Britain, and was built in 1889. In the same year, Abdullah Quilliam installed a mosque in a terrace in Liverpool, which became the Liverpool Muslim Institute. The first mosque in London was the Fazl Mosque, established in 1924, commonly called the London mosque. Quran translators Yusuf Ali and Marmaduke Pickthall, who authored The Meaning of the Glorious Koran: An Explanatory Translation in 1930, were both trustees of the Shah Jehan Mosque in Woking and the East London Mosque. Other aristocratic British converts included Sir Archibald Hamilton, 5th Baronet, Rowland Allanson-Winn, 5th Baron Headley, St John Philby and Zainab Cobbold (the first Muslim woman born in Britain to perform the pilgrimage to Mecca). Immigration and post-World War II Large-scale immigration of Muslims to Britain began after World War II, as a result of the destruction and labour shortages caused by the war. Muslim migrants from former British colonies, predominantly India, Pakistan, and Bangladesh, were recruited in large numbers by government and businesses to rebuild the country. Large numbers of doctors recruited from India and Pakistan, encouraged by health minister Enoch Powell in the early 1960s, also played a key role in the establishment of the National Health Service. British Asians (both Muslim and non-Muslim) faced