| Wicken Fen, Cambridgeshire | England: South | 131 | 485.5 | 33 | 1978 - 2013 |
| River Soar, Leicestershire (with Rutland) | England: Mid | 67 | 361.2 | 11 | < 1980 |
| Hainault Forest, South Essex | England: South | 94 | 447.9 | 41 | 1970 - 2007 |
| Milton-Lockhart Estate, Lanarkshire | Scotland | 55 | 318.2 | 12 | < 2009 |
| Whiteford Burrows NNR, Glamorganshire | Wales | 11 | 163.6 | 1 | < 1998 |
| Windsor Forest, Berkshire | England: South | 363 | 845.7 | 248 | < 1998 |
| Donington Park (total), Leicestershire (with Rutland) | England: Mid | 122 | 450.0 | 48 | 1971 - 2014 |
| Donington Park (<1994), Leicestershire (with Rutland) | England: Mid | 79 | 451.9 | 36 | < 1994 |
| Thorneythwaite, Cumberland | England: North | 50 | 324.0 | 7 | 2017 |
| Wimpole Hall Estate (NT), Cambridgeshire | England: South | 185 | 573.0 | 77 | 1976 - 2019 |
| Chirk Castle Park (NT), Denbighshire | Wales | 194 | 433.5 | 83 | 1993 - 2018 |
| Burnham Beeches, Buckinghamshire | England: South | 262 | 645.4 | 153 | < 2022 |
| Burnham Beeches, Dorneywood NT and Huntswood Farm, Buckinghamshire | England: South | 283 | 689.8 | 178 | < 2022 |
Saproxylic Quality Index