The history of Wellesley House School dates back to 1866 but the present main building was built in 1897 to 1898 in 6 acres (2.4 ha) of grounds.

[3] During World War II, the school was temporarily evacuated to Rannoch in Scotland while the buildings were used by the British Army.

[3] The King felt corporal punishment of Prince George, Duke of Kent when he swam too far out to sea at Joss Bay, despite being warned not to, was appropriate.

[5]: 198  Wellesley House School itself taught one of the Dukes of Gloucester in the 1950s and other prominent pupils included Mike d'Abo, Chris Cowdrey and William Fox-Pitt.

[1] Wellesley Haddon Dene prepares pupils for the Kent Test (11+) alongside potential pathways to Independent education .