Greenfields is proud to be part of the Independent Schools' Association. The Independent Schools' Association (ISA) was founded in 1879 and is one of the oldest of the independent schools associations.

Its membership includes Heads of some 301 preparatory, senior and all-through schools. It exists to provide professional support to Head Teachers and offers a wide range of sport and cultural activities to the pupils in the 301 schools it represents.

There is an annual Art competition, a Drama Festival and Essay competition for all age groups and national ISA fixtures arranged for Athletics, Cross-country, gymnastics and other sports. We regularly participate in the athletics and cross-country regional, and sometimes the national, events.

The Independent Schools Council (ISC), an umbrella organisation that includes a further four organisations for Heads of independent schools, represents the independent schools sector to the government and to the media and through this organisation our "voice" is heard on important issues.