FATHER CHRISTMAS came in the guise of Brigadier-General William Skaer, the new U.S. Air Attache in London, to the R.A.F. Benevolent Fund's school at Vanbrugh Castle, Blackheath, London. He handed out presents from U.S. Air Force at the school's Christmas party. Seen receiving his is eight-year-old David Frost. Nine-year-old Robert Campbell (right) is helping.