[6] The school's former pupils – or "Old Ardinians" – include four Conservative MPs;[7] satirist Ian Hislop;[8] actor Terry-Thomas;[9] Formula One World Champion Mike Hawthorn;[10] author Neil Gaiman;[11] Interscan inventor John Paul Wild;[12] and Allard Motor Company founder Sydney Allard.

[6] St Saviour's College moved to the partially completed site at Ardingly on 14 June 1870 when the new school was officially opened by the Bishop of Chichester, with the inaugural sermon delivered by Samuel Wilberforce.

[6] In addition, 88 Old Ardinians died in the Second World War; their names are recorded in a book of remembrance in the crypt and on the memorial board in the Under.

[6] On 8 May 2008, the Duke of Kent visited Ardingly as part of its sesquicentenary celebrations and officially opened a new teaching block at the pre-preparatory school.

The chapel possesses the east end of the mid block, having four bays each containing a glass-stained window of Decorated sort.

[21] In 1976, cartoonist Nick Newman was expelled from Ardingly in his last term of Upper Sixth for wiring the Chapel to play rock music during a school Mass.

[23] The lodge, which is open to male Old Ardinians as well as those with an affiliation to the college, was founded in 1922 by the then headmaster, Thomas Erskine Wilson, together with masters, the Provost of the school and the Bishop of Lewes.

[24] Freemasonry at Ardingly takes its form from the Enlightenment in England during the 18th century, and shares characteristics with charitable organizations.

The Army section is affiliated to the Princess of Wales's Royal Regiment, allowing cadets to take part in military and adventure training not readily available to non-cadets.

[26] Ardingly takes part in the World Solar Challenge, a biennial solar-powered car race in Australia.

[31] Notable former pupils include four former Conservative MPs, Private Eye editor Ian Hislop,[8] actor Terry-Thomas,[32] author Neil Gaiman, band leader Victor Silvester,[33] Formula One World Champion Mike Hawthorn, and Crufts dog show founder Charles Cruft.