The school originally opened on 24 January1928 with 23 pupils and seven members of staff. In 2004, the school had around 650 pupils and 80 teachers.
Bryanston is a member of the Headmasters' and Headmistresses' Conference and the Eton Group. It has a reputation as being quite a liberal and artistic school (using elements of the Dalton Plan) that puts the student very much at the forefront of what they wish to pursue and achieve. This philosophy was largely backed up by the last headmaster, Tom Wheare. Wheare retired from the Head of Bryanston at the end of the 2005 school year to make way for Sarah Thomas, who started in September 2005.
The festival is a collection of talent from through out the year lower sixth form, which takes place over one weekend in the spring term and involves the whole year to put on plays, concerts, and fashion shows. On the Saturday morning of the festival everyone goes to breakfast in fancy dress. Some of this years costumes included, almong others: Teletubbies, a toy soldier, a tub of marmite, three barbies in boxes, a clown, a sailor captain, and a slutty nurse.
The 2008 A3 festival is notable for having a short film "Jay's Day" and many great plays, including the daring "The Rocky Horror Picture Show", a rendition of "Mean Girls", and an unorthodox play "Scuba Lessons" and cheese. There are also displays of art work and informal concerts. This year the year group also covered the main hall in string.
The sculptor Sir Anthony Caro was a school parent in the 1970s and exhibited at the school in Sculpture, a spectator sport? to celebrate the school's 75th anniversary in 2003.
Trivia
The school's motto is Et nova et vetera (Latin for "both new and old"), and the school's colours are yellow and blue.
The school estate has Europe's tallest London Plane tree (48.16m). This tree may also be England's tallest deciduous tree.
Each year, the JACT Ancient Greek Summer School is held at Bryanston; the school has thus played host to many of the United Kingdom's classicists, both as teachers and pupils.