It was when I first saw Uncle John Harman’s black trousers protruding under Father Christmas’s scarlet robe that my world changed. Up till then I had taken it for granted that grown-ups did not tell lies. Those stories of Father Christmas coming down the chimney, of Father Christmas reading my carefully written yet impassioned pleas for presents, left outside for reindeer to collect, of Father Christmas coming down the chimney bringing the presents – all this must be true because the grown-ups said so.