It's hard to surpass a fantastic film like Groundhog Day, the classic time-loop comedy written by Harold Ramis and starring Bill Murray. Yet Matthew Warchus and Tim Minchin expertly pull it off with the extraordinary Groundhog Day the Musical.

I stumbled upon the show almost by accident, having never seen it advertised or even mentioned anywhere. I was looking for a show to bolt onto a planned London trip. The lazy marketing visuals reminiscent of pound shop flyers, frustrating website and rel...