It was founded in 1894 with a bequest by Henry James Campbell, made his fortune in the linen trade, and left money to found a school based on the values of a Liberal Protestant education. Initially the school was primarily a boarding school but it has, particularly since the 1970s, become primarily a day school; in 2009 it had 879 pupils, only about 85 (10%) of whom were boarders. As a selective independent school, it admits pupils based on academic selection. Until 2006 pupils began at the school at age 11, but since the closure of the school's separate preparatory school, Cabin Hill, the school has accepted pupils from age 4 into the newly built Junior School, and both boys and girls into the school's kindergarten located on the school's grounds. The Latin motto of the school is "Ne Obliviscaris" ("Do Not Forget").