Tonight The Book of Mormon, the wildly acclaimed Broadway musical from South Park creators Trey Parker and Matt Stone, has its first performance in London. This opening might seem less contentious than the show’s Broadway premiere in 2011. The Church of Jesus Christ of Latter Day Saints, to give it its full title, is hugely influential in the US — where it almost won the Presidency, remember — and in Mexico and South America. But of the 13,824,854 members worldwide claimed by the church in 2010 — quite an increase from the original six believers recruited by founder Joseph Smith, and considerably more than the five million members who critics claim are active believers — only 188,000 lived in the UK. Oh, plus four in the Falkland Islands.