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,
Lincolnshire Day Newton – scientist, Alfred Lord Tennyson - Poet Laureate, Baroness Thatcher – Prime Minister, Matthew Flinders – explorer, Joseph Banks – explorer and botanist, George Boole – mathematician, Tony Jacklin CBE – golfer, Dame Joan Plowright – actress and Jim Broadbent – actor. Lincolnshire Day is supported by county businesses and organisations including BBC Lincolnshire, Lincolnshire Co-operative, The Lincolnite, Lincolnshire Business, the Lincolnshire Echo, Lincolnshire Tourism, Lincoln Cathedral, Lincolnshire Life, Lincoln BIG, Tastes of Lincolnshire, Lincolnshire County Council, Shooting Star PR, POP Design and the Lincolnshire Sports Partnership. Lincolnshire Day Lincolnshire Day is celebrated every year on 1 October and