The schools in the group are:
Five of the Rugby Group schools, Charterhouse School, Harrow School, Winchester College, Rugby School and Shrewsbury School are members of the original nine 'Clarendon' public schools defined under the Public Schools Act 1868, with the other Clarendon schools (Eton College, St Paul's School, Merchant Taylor's School and Westminster School) having other affiliations.
In 2003, as part of a wider investigation into alleged fee fixing at UK independent schools, the Office of Fair Trading published an email exchange between the bursars of Rugby Group schools containing detailed information about planned fee levels at each of the schools. The case was settled in 2006, with 50 schools admitting that such exchange of information "involved a distortion of competition and infringed competition law", but not admitting to any effect on fees. The schools each paid a £10,000 penalty, and agreed to make ex-gratia payments totalling £3 million to a trust to benefit pupils attending the schools in the relevant years.