Awful Auntie stormed into the Birmingham New Alexandra Theatre tonight delighting both children and adults alike. The latest David Walliams novel to be adapted for the stage has all the hallmarks that make Walliams’s books so brilliant, a monstrous villain, a plucky, determined child, a story of loss and friendship. But, unlike the other Walliam’s stories, this is a story set in the past, in the 1920s, and there’s no sign of Raj. That said,it is still a brilliantly told tale, and in Alberta Saxby, it has one of the most memorable baddies in recent times. Stella Saxby is 12, almost 13, when she wakes up in her bed swathed…