As part of our incredibly serious investigation into materials, we opened up a potion shop this morning in Air Class. The children relished purchasing large quantities of eyeballs, brains, phoenix feathers and plenty of toad slime. Despite being on sale, the princess hair didn’t sell that well, however. Nevertheless, the children were amazingly efficient at spending money (no surprise to some parents!), and were able to practise one of the most treasured aspects of British culture… queuing to pay.