sentences:  By 1977, a study of the school's population of 650 14- to 18-year-old boys, showed that the school was the most ethnically diverse in the UK, with an overall mix of 51% non-white grandparents.The school's legacy as a grammar school permeated its culture and structure even into its comprehensive era.Masters continued to wear gowns and it retained a two-tier prefect system, the cane, and a public school 4 house system