Grantham and eminent past students. Britain's first female Prime Minister, Margaret Thatcher, attended Kesteven and Grantham, and Isaac Newton famously attended The King's. Both have remained single-sex up to the age of 16. In 1970, Kesteven County Council (based in Sleaford) announced plans to turn the grammar schools into co-educational comprehensives for ages of 11–16 and leave Grantham College the only sixth form for the town. Later it was proposed to create two sixth-form colleges from one of the grammar schools. Other parts of Kesteven became comprehensive but responsibility for education passed to Lincolnshire under the local government reorganization of 1974,
Margaret Thatcher her premiership. Thatcher was parodied by Wells in several media. He collaborated with Richard Ingrams on the spoof "Dear Bill" letters, which ran as a column in "Private Eye" magazine; they were also published in book form and became a West End stage revue titled "Anyone for Denis?", with Wells in the role of Denis Thatcher. It was followed by a 1982 TV special directed by Dick Clement, in which Thatcher was played by Angela Thorne. Since her resignation as Prime Minister in 1990, Thatcher has been portrayed in a number of television programmes, documentaries, films and plays. She was