The school was founded in 1943 in the buildings of Westminster School in Little Dean’s Yard, just behind Westminster Abbey. In 1951 the Under School relocated to its own site in Eccleston Square. Due to rising numbers of students in the 1960s and 1970s, the school moved again in 1981 to its present site (which was a former hospital) next the Westminster School playing fields in Vincent Square. There are 267 pupils attending the school. The school has a strong musical tradition and provides choristers for St Margaret's Church, London. 