A geography teacher who had a cocaine addiction and posted about his drug use on social media has been banned from the profession. Austin Whiting, who was head of Year 13 at Borden Grammar School in Sittingbourne, also had an inappropriate conversation with a vulnerable pupil, a misconduct panel found. Mr Whiting joined the school in Avenue of Remembrance back in 2004 but handed in his resignation on March 8 last year, saying he wanted to see out the academic year before leaving. However, a hearing in front of the Teaching Regulation Authority heard that, two days later, while working his noti…