| 26 | Berkhamsted School | 1,431 pupils | Independent · Boarding · 6th | Berkhamsted, East of England | — ISI · Good |
| 27 | Immanuel College | 446 pupils | Independent · Day · 6th | Bushey, East of England | — ISI · Good |
| 28 | Haileybury College | 916 pupils | Independent · Boarding · 6th | Hertford, East of England | — ISI · Good |
| 29 | King's Ely | 1,156 pupils | Independent · Boarding · 6th | Ely, East of England | — |
| 30 | Bedford Girls' School | 906 pupils | Independent · Day · 6th | Bedford, East of England | — ISI · Good |
| 31 | St Columba's College | 830 pupils | Independent · Day · 6th | St Albans, East of England | — |
| 32 | Langley School | 415 pupils | Independent · Boarding · 6th | Norfolk, East of England | — ISI · Good |
| 33 | Chigwell School | 1,111 pupils | Independent · Boarding · 6th | Chigwell, East of England | — |
| 34 | Bishop's Stortford College | 1,245 pupils | Independent · Boarding · 6th | Bishop's Stortford, East of England | — |
| 35 | Bedford Modern School | 1,252 pupils | Independent · Day · 6th | Bedford, East of England | — ISI · Good |
| 36 | Norwich School | 1,170 pupils | Independent · Day · 6th | Norwich, East of England | — |
| 37 | Queenswood School | 463 pupils | Independent · Boarding · 6th | Hatfield, East of England | — ISI · Good |
| 38 | St Francis College | 287 pupils | Independent · Boarding · 6th | Letchworth Garden City, East of England | — ISI · Good |
| 39 | Abbey College Cambridge | 428 pupils | Independent · Boarding · 6th | Cambridgeshire, East of England | — ISI · Good |
| 40 | The Peterborough School | 514 pupils | Independent · Day · 6th | Peterborough, East of England | — ISI · Good |
| 41 | Thetford Grammar School | 202 pupils | Independent · Boarding · 6th | Unknown, East of England | — ISI · Good |
| 42 | Cambridge Arts and Sciences (CATS and CSVPA) | 534 pupils | Independent · Boarding · 6th | Cambridge, East of England | — ISI · Good |
| 43 | Sherrardswood School | 467 pupils | Independent · Day · 6th | Welwyn, East of England | — ISI · Good |
| 44 | Ipswich High School | 534 pupils | Independent · Boarding · 6th | Unknown, East of England | — ISI · Good |
| 45 | Norwich High School for Girls GDST | 563 pupils | Independent · Day · 6th | Unknown, East of England | — ISI · Good |
| 46 | Finborough School | 680 pupils | Independent · Boarding · 6th | Stowmarket, East of England | — ISI · Good |
| 47 | Framlingham College | 557 pupils | Independent · Boarding · 6th | Woodbridge, East of England | — |
| 48 | Tring Park School for the Performing Arts | 333 pupils | Independent · Boarding · 6th | Tring, East of England | — ISI · Good |
| 49 | Stoke College | 104 pupils | Independent · Boarding · 6th | Sudbury, East of England | — ISI · Good |
| 50 | The Purcell School | 195 pupils | Independent · Boarding · 6th | Unknown, East of England | — ISI · Good |