Speaking of Cher, Craymer sips on an Aqua de Madre pink grapefruit and lime water kefir while we speak in her central London office, which is filled with "Mamma Mia!" promotional items and pictures.

Critics are supposed to be snooty about “Mamma Mia!” I mean, the show is built around a farcical plot crammed in among a bunch of ABBA’s 1970s dancey Europop tunes. And let’s not forget ...

“I don’t really like Mamma Mia!” I must have said it a hundred times before, always muttered hesitantly to someone who does, reluctant to yuck their yum. Granted, I only knew the all-ABBA ...