GKT is notable for having been part of the twenty-one founding members of the Rugby Football Union (the Guy's team), and across its joint history has produced many international players.

The date of 1843 is based on circumstantial evidence predominantly in the form of a fixture card from 1883/4 referring to Guy's 40th season and the submission of distinguished officials in 1863 and 1864.

(originally known simply as the Barnes Club), claims to have been founded in 1839,[2] but this has no contemporary documentation and its circumstantial evidence is neither as abundant nor as compelling as that of Guy's Hospital.

On 26 January 1871, they sent representation to a meeting of twenty-one London and suburban football clubs that followed Rugby School rules assembled at the Pall Mall Restaurant in Regent Street.

A president, a secretary and treasurer, and a committee of thirteen were elected, to whom was entrusted the drawing-up of the laws of the game upon the basis of the code in use at Rugby School.

[3] In the nineteenth century Guy's did produce some international players, including Alan Ayre-Smith, W. W. Pinching, A. W. Pearson, and A. H. Jackson, and they did have some success in the Inter-Hospital Challenge Cup.

However, it was in the 1920s and '30s that Guy's reached its zenith and was arguably the most formidable team in the land especially when under the captaincy of the Ireland international and Irish national captain W.D.

In total Guy's has won the United Hospitals Challenge Cup 32 times, a record that stood for many years until St. Mary's/Imperial Medics overtook it.

In 1869, 90 members from King's College formed a football club representing faculties including the Medical Department.

Like Guy's Hospital, King's sent representation to the 1871 meeting at the Pall Mall Restaurant in Regent Street that formed the Rugby Football Union.

The GKT Rugby team won back the United Hospitals Cup from Imperial Medics, at the Richmond Athletic Ground, on Sunday 22 March 2009 for the first time in many years.G.K.T.