Global smash hit musical Mamma Mia! celebrated its 20th anniversary in London’s West End at the Novello Theatre on 6 April 2019. At the special performance, 13 former ‘Dynamos’ joined in the finale and at the curtain call producer Judy Craymer, director Phyllida Lloyd, book writer Catherine Johnson and ABBA songwriters Benny Andersson and Björn Ulvaeus just happened to be there too. How can we resist this show?