K&K incorrectly list this as an OTC. It was a Cadet Corps wearing its school badge design until its closure in 1931.
A CCF was founded post WW2 but it wore the GS Cap badge. This badge is shown on the school website and has been confirmed by an old-boy of the CCF from the 1950s.
The CCF was wearing the RASC badge by 1958 (local unit was Bicester) and was later affiliated to the RAOC when that was formed.
https://www.flickr.com/photos/oldtam...7600463934561/