The Sixth Form Centre serves as the main hub for students in Year 12 and 13, and the new building provided more space for study and relaxation.

[19][20][21] Before the original hall was demolished, there was controversy over a number of local children's play groups being evicted from the new building,[22] with the site being sold by Llandaff Cathedral primarily for financial reasons.

He was involved in the "Great Mouse Plot of 1924", which he later described in his autobiography, Boy: Tales of Childhood, where he and a group of friends placed a dead mouse in a sweet jar at a local shop with an unpopular elderly female owner.

This is the first of numerous occasions in which he outlines in great detail the perceived cruelty of corporal punishment in the schools he attended.

A traditional academic education, with sciences separately taught by specialists, along with a range of modern languages (French, Spanish, German) in addition to Latin, is delivered alongside very competitive sport (senior pupils have an unusually generous amount of time allocated to sport) and opportunities in the Arts.

2018 was the first year that Cathedral School pupils sat exams under the reformed English system of GCSEs (on a scale of 9 to 1 rather than A* to G).

Each year at the end of the Lent term, 10 prefects are chosen by the Head to assist with pastoral support and leadership.

All pupils and students from Year 3 upwards attend weekly 20 minute services in Llandaff Cathedral, with a longer Eucharist at the beginning of each half term.

The school continues to provide both the Boy and Girl Choristers for Llandaff Cathedral,[2][3] and as such has very strong choirs.

The boy choristers have sung in the Wales Millennium Centre, with Welsh National Opera, Bryn Terfel and Carlo Rizzi.

There are numerous musical groups, including: Drama has thrived only recently in the school but is rapidly expanding.

Summer productions have included: Over twenty sports are played at the school, with pupils at international level in cricket, badminton, rugby, gymnastics and sailing.

All of the senior section take part in 2 lessons of Games a week, choosing from the seasonal sports of: Rugby, Football, and Cricket (for the boys); Hockey, Netball, and Rounders (for the girls); Rowing, Tennis, Climbing and Squash (mixed gender, year-round sports held outside of school).