Soho, LondonDressed in his warmest coat, his stash of pickles and crisps already eaten, four-year-old Ivan stands in a rubbish dump, gazing hungrily at a hole in the ground. Perhaps a woman waits for him down there, a kind mother who will care for him. But all he finds in the sewer is a violent bully who kicks him, and a crowd of vacant-eyed children addicted to glue. So he returns to the cold streets of Yeltsin's Mo…