Good witches and witches dubbed bad and born green. Wicked is one of those pieces of musical theatre that will dazzle the young with its lustre and grandeur as well as that great song, ‘Defying Gravity’. Sheridan Adams as Elphaba is initially tight and bewildered while Courtney Monsma is all radiant languor as Glinda the witch who’s been encouraged to believe how good she is and her ease shows given her advantages.