It’s something to do with the heady feel good atmosphere generated by just the impression of a greek island holiday even though you are in the middle of the big city. You don;t necessarily have to be a big fan of Abba’s songs either, I know I’m not – but the game of guessing how the plot is weaving along to include yet another classic is almost as much fun as the superb acting and singing. The film of Mamma Mia! was pretty good too, with Maryl Streep proving she can sing for the first time to her usual film audience.