| 1 | Sevenoaks School | 1,244 pupils | Independent · Boarding · 6th | Sevenoaks, South East | — ISI · Good |
| 2 | Brighton College | 1,287 pupils | Independent · Boarding · 6th | Brighton, South East | — ISI · Good |
| 3 | Charterhouse | 996 pupils | Independent · Boarding · 6th | Godalming, South East | — ISI · Good |
| 4 | Marlborough College | 1,004 pupils | Independent · Boarding · 6th | Wiltshire, South West | — ISI · Good |
| 5 | The King's School Canterbury | 958 pupils | Independent · Boarding · 6th | Canterbury, South East | — ISI · Good |
| 6 | Latymer Upper School and Latymer Prep | 1,428 pupils | Independent · Day · 6th | London, London | — ISI · Good |
| 7 | Highgate School | 1,946 pupils | Independent · Day · 6th | Unknown, London | — ISI · Good |
| 8 | Bedales School | 768 pupils | Independent · Boarding · 6th | Petersfield, South East | — ISI · Good |
| 9 | Wellington College | 1,138 pupils | Independent · Boarding · 6th | Unknown, South East | — ISI · Excellent |
| 10 | The Perse School | 1,735 pupils | Independent · Day · 6th | Unknown, East of England | — ISI · Good |
| 11 | Royal Grammar School | 1,330 pupils | Independent · Day · 6th | Newcastle-upon-Tyne, North East | — ISI · Good |
| 12 | Solihull School | 1,564 pupils | Independent · Day · 6th | Solihull, West Midlands | — ISI · Good |
| 13 | Oundle School | 1,134 pupils | Independent · Boarding · 6th | Northamptonshire, East Midlands | — ISI · Good |
| 14 | Shrewsbury School | 826 pupils | Independent · Boarding · 6th | Shrewsbury, West Midlands | — ISI · Good |
| 15 | Rugby School | 869 pupils | Independent · Boarding · 6th | Rugby, West Midlands | — ISI · Good |
| 16 | Forest School | 1,590 pupils | Independent · Day · 6th | London, London | — ISI · Good |
| 17 | Bancroft's School | 873 pupils | Independent · Day · 6th | Woodford Green, London | — ISI · Good |
| 18 | Colfe's School | 1,308 pupils | Independent · Day · 6th | London, London | — ISI · Good |
| 19 | Concord College | 547 pupils | Independent · Boarding · 6th | Shrewsbury, West Midlands | — ISI · Good |
| 20 | Stowe School | 901 pupils | Independent · Boarding · 6th | Buckingham, South East | — ISI · Good |
| 21 | Reigate Grammar School | 1,564 pupils | Independent · Day · 6th | Reigate, South East | — ISI · Good |
| 22 | Brentwood School | 1,878 pupils | Independent · Boarding · 6th | Brentwood, East of England | — ISI · Good |
| 23 | Uppingham School | 839 pupils | Independent · Boarding · 6th | Unknown, East Midlands | — ISI · Good |
| 24 | Cardiff Sixth Form College, Cambridge | 98 pupils | Independent · Boarding · 6th | Unknown, East of England | — |
| 25 | Repton School | 626 pupils | Independent · Boarding · 6th | Derby, East Midlands | — ISI · Good |