in the 1890s collyer's taught 110 boys from ages 7 to 17, both boarders and day-schoolers, and for the first time included a sixth form to study for university entrance. from 1923 the rev. w.m. peacock started to model the school on public school lines, introducing (among other things) four houses (see below), "the horsham grammar school magazine" (later to become "the collyerian"), and a school song. by 1926 it was a single-stream school of 220 boys with a sixth form of “less than a dozen”, and ten teaching staff.