[1] It was established after Helena Miller (of Leo Baeck College) observed that while her son had gone to JFS, many of his friends had not been able to attend because of oversubscription and halachic requirements.

In 2001, she initiated a process of community engagement and consultation which led ultimately to the successful proposal for a new faith school.

[2] Gerald Ronson, a business tycoon and philanthropist, helped in the fundraising drive and is the president of the JCoSS Trust.

[10] Before the school opened, several Orthodox rabbis expressed concern over JCoSS's compatibility with their faith.

[13] In 2019, JCoSS was named The Sunday Times' London State Secondary School of the Year, in recognition of its record-breaking results in GCSE and A Levels.