Nearly two years after opening in London, The Book of Mormon remains one of the West End's hottest tickets. This was my first return trip to the show since I first saw it - you can read my original review here - and this time it was my Christmas present to my sister. American actors A.J. Holmes and Billy Harrigan Tighe have taken over the lead roles of Elders Cunningham and Price, and Kevin Harvey has replaced Giles Terera as the Elders' guide to the Ugandan village, Mafala Hatimbi, but otherwise the main cast have all stuck around - although tonight Lucy St Louis was understudying Alexia Khadime as Nabulungi and doing a good job of it, with a powerful voice in the funny but touching "Sal Tlay Ka Siti." Although the show was never overlong in the first place, it now seems to have shed an extra 15 minutes from when I last saw it, making it zip past all the more speedily and satisfyingly.