Before its establishment Kesteven Local Education Authority had founded the Grantham Institute, which accepted girls.

[citation needed] Thirty-two Camden girls were confirmed at St Wulfram's Church, Grantham on Saturday 16 March 1940 by the bishop of Lincoln, Nugent Hicks.

[6] On Friday 28 June 1940, two 17-year-old Camden girls, Margaret McMillan and Marjorie Catch, had their play A Man's World broadcast as part of Theatreland on the BBC Home Service and the BBC Forces Programme, introduced by Raymond Glendenning; it featured Celia Johnson and Owen Nares.

Elsie Suddaby, the famous soprano performed at the school, through Grantham Music Club, on Friday 18 October 1940.

[9] Isolde Menges, the violinist, performed on Friday 22 November 1940 at the school [10] Colonel William Vere Reeve King-Fane was Chairman of the Governors from December 1940, until his death in 1943.

[citation needed] The extensions opened on Friday 11 October 1957, for a three-form entry school, with a new gym, hall and dining room, and crafts room with a hand loom with the bishop of Grantham Anthony Otter attending the ceremony and the chair of the governors Alf Roberts, with T.W.

[citation needed] When prime minister Margaret Thatcher visited on Friday 12 February 1982 there were 150 protesters, who mostly chanted 'Tories Out'.

[27][28] Pupils are allotted to one of six houses within the school, named after famous female writers and poets: Austen, Brontë, Browning, Eliot, Potter, and Rossetti.

Each house has its own colour: Austen is purple, Potter is green, Rossetti is red, Bronte is white, Browning is black and Elliot is yellow.

[citation needed] The school won the U-19 Championships of the English Schools' Table Tennis Association (ESTTA) three times in a row from 2009 to 2011, and had also won it, 1986–88; the representative of the English Table Tennis Association for the East Midlands, Suzanne Airey, went to KGGS.