It is hard to believe... but this is a different show. Two different musicals on this topic just played at the Edinburgh Fringe and the one transferring to the Criterion is the other one!
It’s actually a completely different production! (Astonishingly, there are currently three completely unrelated theatre productions in the UK based on the Paltrow ski trial.)
The Awkward Productions one has a man playing GP and is titled “Gwyneth Goes Skiing” and has been around for a few months now, the West End one has Diana Vickers playing Gwyneth and is titled “I Wish You Well” and debuted in Edinburgh this month.