A head teacher has angered parents by asking them to stop their daughters from wearing thongs to school.Anna Roxburgh, the head of Hamp Junior High School in Bridge Water, Somerset made the plea to parents of 6th Grade Girls, ages 10-11.In a letter she said she had no objection to thongs personally.But she was concerned about the girl possible embarassment while changing for Physical Education Class, falling over in the playground or doing handstands. Hamp Junior High is a mixed -sexes school with 270 puplis. One mother said the letter was 'unbeliveable.' She added: 'Schools lay down enough rules without...