‘Stop chatting to your friends,’ said Miss Taff, ‘and pay attention.’ She snatched Sidney’s mobile, stuffed it into her crocodile handbag and snapped the clasp shut. The boy mumbled that he didn’t have any friends and sat down in front of the make-up table. Rummaging through a box of grease paints he found a stick of red carmine and streaked a scar across his mouth. …