[2] Post war, Wandsworth School began to expand and broaden its intake beyond the academic range.

[7] New buildings were opened on the site's playing fields, including a planetarium, the first in a British school, a swimming pool and workshops for technical and vocational training.

[5] During much of its history Wandsworth School enjoyed continuity of leadership, with only two headmasters in 63 years: H Thwaite from 1900 to 1932, and H. Raymond King from 1932 to 1963.

[3] King was a strong advocate of comprehensive education, and led the school's post war expansion.

[2][15] The choir performed at a number of major music festivals, including the Proms and the Aldeburgh Festival,[16] and undertook recordings alongside professional orchestras, including the London Symphony, New Philharmonia, London Philharmonic and the Dutch Concertgebouw.

[18] In 1929 alumni of the school formed the Old Wandsworthians Rugby Football Club which was initially based at their ground on Woodstock Lane in Claygate.