A married teacher quit his job and was warned by police after he was filmed kissing a student.
Media studies manager Lee Fountain was questioned by officers following the incident at Chatham and Clarendon Grammar School in Ramsgate this month.
Police received a report alleging inappropriate behavior between the 44-year-old and a student at the Clarendon Gardens site on October 13.
Fountain was immediately suspended by the school and a week later was given a formal warning after admitting an offense of sexual activity with a child by an adult in a position of trust.
Bosses of the illustrious selection – which featured former Tory leader Sir Edward Heath and Labor MP John Ovenden – have confirmed Fountain no longer teaches at the school.
Head teacher Debra Liddicoat said: ‘Following a police investigation, a teacher at Chatham and Clarendon Grammar School has been notified.
“The investigation is now closed. The staff member concerned was immediately suspended and has now left the school.
“The safety and well-being of all our students is, at all times, our priority and we take matters of this nature very seriously.
“We will now conduct an HR investigation while continuing to engage with the Local Authority Designated Officer (LADO) to address concerns regarding this incident.
“The LADO will provide professional oversight of the school as necessary and ensure that all practices and procedures are being followed at this time.”
MailOnline reports that pupils were first told by email that Fountain – who was also second in charge of English – would not be in class a fortnight ago.
The website says Ms Liddicoat later wrote to youngsters and parents before the mid-term break to say Fountain was no longer employed by the school.
Historical grammar dates back to the 1700s.
Lists of his alumni include TV personality Frank Muir, Hawkwind founder Nik Turner, Olympic gold medalist hockey player Sean Kerly and rugby player Matt Corker.