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,
Isaac Newton Telescope by Grubb Parsons after the move. INT locations are Herstmonceux Castle (1967–79) then ORM (1984–). The INT was inaugurated by Queen Elizabeth II in 1967. Largest optical telescopes 1967: INT began its new life atop the Canary Island of La Palma, a Spanish mountain island, in 1984, with a new mirror and dome. Large visible-light optical ground telescopes in 1984: Isaac Newton Telescope The Isaac Newton Telescope or INT is a 2.54 m (100 in.) optical telescope run by the Isaac Newton Group of Telescopes at Roque de los Muchachos Observatory on La Palma in the Canary Islands since 1984.