Hallelujah! The divinely camp Sister Act London production has a heaven-sent new addition in Ruth Jones, who joins this musical adaptation of the 1992 movie for its latest West End stint. Jones certainly knows how to handle an audience, batting away an errant wolf whistle on opening night with a sardonic “Yeah, all right” – to the delight of former Gavin & Stacey castmates in attendance such as James Corden, Rob Brydon and Alison Steadman.