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 the Islands in January 1983, six months after the end of the Falklands War in June 1982. Thatcher became a member of the Lords in 1992 with a life peerage as Baroness Thatcher, of Kesteven in the County of Lincolnshire. Subsequently, the College of Arms granted her usage of a personal coat of arms; she was allowed to revise these arms upon her appointment as Lady of the Order of the Garter (LG) in 1995, the highest order of chivalry for women. In the US, Thatcher received the Ronald Reagan Freedom Award, and was later designated Patron of The Heritage