| 1 | Winchester College | 734 pupils | Independent · Boarding · 6th | Winchester, South East | — ISI · Excellent |
| 2 | Tonbridge School | 803 pupils | Independent · Boarding · 6th | Tonbridge, South East | — ISI · Good |
| 3 | Sevenoaks School | 1,244 pupils | Independent · Boarding · 6th | Sevenoaks, South East | — ISI · Good |
| 4 | Magdalen College School | 950 pupils | Independent · Day · 6th | Oxford, South East | — ISI · Good |
| 5 | St Paul's School | 1,517 pupils | Independent · Boarding · 6th | London, London | — |
| 6 | Cheltenham Ladies' College | 833 pupils | Independent · Boarding · 6th | Cheltenham, South West | — ISI · Good |
| 7 | Brighton College | 1,287 pupils | Independent · Boarding · 6th | Brighton, South East | — ISI · Good |
| 8 | Eton College | 1,346 pupils | Independent · Boarding · 6th | Windsor, South East | — ISI · Good |
| 9 | Charterhouse | 996 pupils | Independent · Boarding · 6th | Godalming, South East | — ISI · Good |
| 10 | Westminster School | 773 pupils | Independent · Boarding · 6th | London, London | — ISI · Good |
| 11 | Marlborough College | 1,004 pupils | Independent · Boarding · 6th | Wiltshire, South West | — ISI · Good |
| 12 | Guildford High School | 1,021 pupils | Independent · Day · 6th | Guildford, South East | — ISI · Good |
| 13 | James Allen's Girls' School | 1,212 pupils | Independent · Day · 6th | London, London | — ISI · Good |
| 14 | The King's School Canterbury | 958 pupils | Independent · Boarding · 6th | Canterbury, South East | — ISI · Good |
| 15 | The Manchester Grammar School | 1,659 pupils | Independent · Day · 6th | Manchester, North West | — ISI · Good |
| 16 | The Godolphin and Latymer School | 804 pupils | Independent · Day · 6th | London, London | — ISI · Good |
| 17 | City of London School | 1,074 pupils | Independent · Day · 6th | London, London | — ISI · Good |
| 18 | King's College School | 1,507 pupils | Independent · Day · 6th | London, London | — |
| 19 | St Paul's Girls' School | 824 pupils | Independent · Day · 6th | London, London | — |
| 20 | Hampton School | 1,548 pupils | Independent · Day · 6th | Hampton, London | — ISI · Excellent |
| 21 | Latymer Upper School and Latymer Prep | 1,428 pupils | Independent · Day · 6th | London, London | — ISI · Good |
| 22 | Dulwich College | 1,919 pupils | Independent · Boarding · 6th | London, London | — ISI · Good |
| 23 | Sherborne School | 573 pupils | Independent · Boarding · 6th | Sherborne, South West | — ISI · Good |
| 24 | Wycombe Abbey | 644 pupils | Independent · Boarding · 6th | High Wycombe, South East | — ISI · Good |
| 25 | Highgate School | 1,946 pupils | Independent · Day · 6th | Unknown, London | — ISI · Good |