Chatham & Clarendon Grammar School

The two schools had often partnered with each other for extra-curricular activities and field trips. Both schools were single sex until sixth form, then allowing both male and female students. At sixth form, some AS and A level subjects were taught jointly by both schools; or by one school, however Clarendon House was unsubscribed.

The two schools federated in January 2011 to become a converter academy.^[4] bringing greater control over admissions, site & buildings and curriculum development as well as additional income.^[5] In this intermediate stage, Year 9 was moved to the lower school while the decisions about the sites were being taken. House systems were merged based on student voting.^{[citation needed]}

Following an Ofsted assessment in 2025, the school progressed from a diamond model to fully coeducational classes.^[6]

Virtually all maintained schools and academies follow the National Curriculum, and are inspected by Ofsted on how well they succeed in delivering a 'broad and balanced curriculum'.^[7] Schools endeavour to get all students to achieve the English Baccalaureate (EBACC) qualification- this must include core subjects, a modern or ancient foreign language, and either History or Geography. Schools are obliged to publish the philosophy governing their curriculum on their website.^[8]

• Iain Aitch – Author and journalist
• Herbert William Allingham – Surgeon to the Household of King Edward VII, and surgeon in ordinary to the Prince of Wales (later King George V)^[11]
• Allan Butler – Ambassador to Mongolia from 1984 to 1987
• Patrick Crawford – Commandant from 1989 to 1993 of the Royal Army Medical College
• Jamie Davies – Racing driver
• Matt Dunn – Romantic comedy novelist
• Marc Gascoigne – Fantasy writer
• Peter Gregory (academic)^[12] – Director since 2005 of the Scottish Crop Research Institute at Invergowrie near Dundee, and Professor of Soil Science from 1994–2005 at the University of Reading
• Geoffrey Colin Guy – Governor of Saint Helena from 1976 to 1981, and Commissioner of the Turks and Caicos Islands from 1958 to 1959 and 1959–1965
• Edward Heath – Prime Minister of the United Kingdom from 1970 to 1974^[13]
• Stewart Jackson – Conservative MP for Peterborough from 2005 to 2017
• Sean Kerly – Olympic field hockey player^[14]
• Claire Kohda – Writer and violinist
• Marc Lawrence^[15] – Sea King observer of 849 Naval Air Squadron, killed on 21 March 2003 in a crash in Kuwait
• John Marek – Labour MP for Wrexham from 1983–2001
• Frank Muir – Humourist^[16]
• Edward Norman – Gave the BBC Reith Lecture in 1978
• John Ovenden – Labour MP for Gravesend from 1974 to 1979 and Leader of Kent County Council from 1994 to 1997
• Geoff Parsons – Olympic high jumper
• Charles Robson – Middlesex and Hampshire wicket-keeper, and secretary (manager) of Southampton Football Club^[17]
• Robert Tavernor – Emeritus professor of architecture and urban design at the London School of Economics (LSE)
• Peter Terry – Station commander from 1968 to 1970 of RAF El Adem (in Libya) and Governor of Gibraltar from 1985 to 1989.
• Nik Turner – Founder of the space rock band Hawkwind^[18]
• Gregory James Venables – Archbishop of South America since 2001
• Bill Wratten – Air Officer Commanding-in-Chief of RAF Strike Command during the first Gulf War, station commander from 1980 to 1982 of RAF Coningsby