 Complete the following phrase:  Sheelagh Warren was Headmistress of Gayaza High School for 18 years. She took over from Miss Joan Cox when she left, having overseen the development of the secondary school to O and A levels, the construction of most of the permanent buildings and the establishment of the schools reputation for academic excellence, and more. Warren steered the school through Ugandas most turbulent times - through the 1979 war that toppled Idi Amin, the five-year 