Commentary on Sections Schedule 11: Schools: exceptions Effect
862.This paragraph allows a single-sex school to refuse to admit pupils of the opposite sex. A school is defined as single-sex if it admits pupils of one sex only. This is so even if it admits a small number of pupils of the opposite sex on an exceptional basis or in relation to particular courses or classes only. Limiting those pupils to particular courses or classes is not discrimination. However, other forms of sex discrimination by the school against its opposite-sex pupils would still be unlawful.