Knettishall Heath is a 91.7-hectare (227-acre) biological Site of Special Scientific Interest west of Knettishall in Suffolk. A larger area of 176 hectares is the Knettishall Heath Nature Reserve, which is managed by the Suffolk Wildlife Trust.
Hackhurst and White Downs is a 185.1-hectare (457-acre) biological Site of Special Scientific Interest west of Dorking in Surrey. White Downs is a Nature Conservation Review site, Grade 2, and part of it is in the 200-hectare (490-acre) White Downs nature reserve, which is owned by the Wotton Estate and managed by the Surrey Wildlife Trust (SWT). Hackhurst Downs is a 29.9-hectare (74-acre) Local Nature Reserve, which part of the 40-hectare (99-acre) Hackhurst Downs nature reserve, which is owned by Surrey County Council and also managed by the SWT.
Groton Wood is a 20.2-hectare (50-acre) biological Site of Special Scientific Interest north-east of Groton in Suffolk. It is owned and managed by the Suffolk Wildlife Trust.
Pitstone Hill is a 22.9-hectare (57-acre) biological Site of Special Scientific Importance east of Pitstone in Buckinghamshire. It is in the Chilterns Area of Outstanding Natural Beauty, and is crossed by the Ridgeway National Trail.
Saltbox Hill is a 22.2 biological Site of Special Scientific Interest in three separate areas in Biggin Hill in the London Borough of Bromley. One area of 6.9 hectares is owned and managed by the London Wildlife Trust. It is also a Site of Metropolitan Importance. It is a steeply sloping 55 acre biological site, which is close to Charles Darwin's home, Down House, and inspired him and provided him with a picnic place.
Aston Clinton Ragpits is a 2.9-hectare (7.2-acre) biological Site of Special Scientific Interest in Aston Clinton in Buckinghamshire. It is a former chalk quarry, which is now a nature reserve managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust. It is in the Chilterns Area of Outstanding Natural Beauty.
Limekiln Close and East Pit is a 10 hectare Local Nature Reserve (LNR) in Cherry Hinton, on the south-eastern outskirts of Cambridge. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire as Cherry Hinton Chalk Pits. East Pit is part of the Cherry Hinton Pit biological Site of Special Scientific Interest, which excludes Limekiln Close but includes the neighbouring West Pit.
Alder Wood and Meadow is a 13.2-hectare (33-acre) biological Site of Special Scientific Interest south-west of Corby in Northamptonshire.
An area of 39.1 hectares in the north-west corner of Geddington Chase has been designated a biological Site of Special Scientific Interest (SSSI). It is located south-east of Corby in Northamptonshire.
Stoke and Bowd Lane Woods is a 36.4 hectare biological Site of Special Scientific Interest west of Corby in Northamptonshire. The eastern half of Stoke Wood is managed by the Woodland Trust, a triangular area of 0.7 hectares which stretches south from the middle is the Stoke Wood End Quarter, a nature reserve managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire, and the remaining western part of the wood is private property. Bowd Lane Wood is private property.
Barford Wood and Meadows or Barford Meadow Nature Reserve is a 36 hectare nature reserve east of Rushton in Northamptonshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. The north-eastern end is part of the River Ise and Meadows Site of Special Scientific Interest.
Wakerley Spinney is a 4.4-hectare (11-acre) biological Site of Special Scientific Interest west of King's Cliffe in Northamptonshire.
Southfield Farm Marsh is an 8.6-hectare (21-acre) biological Site of Special Scientific Interest in Kettering in Northamptonshire. An area of 2.8 hectares is managed as a nature reserve by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.
Short Wood and Southwick Wood is a 54.7-hectare (135-acre) nature reserve north-west of Oundle in Northamptonshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. Short Wood is a 25.3-hectare (63-acre) biological Site of Special Scientific Interest.
Harby Hill Wood is a 16.9-hectare (42-acre) biological Site of Special Scientific Interest west of Eastwell in Leicestershire.
Chater Valley is a 3.8-hectare (9.4-acre) biological Site of Special Scientific Interest north of Loddington in Leicestershire.
Burton Park SSSI is a 57.7-hectare (143-acre) biological Site of Special Scientific Interest west of Pulborough in West Sussex. A larger area of 63 hectares, including Chingford Pond to the west, is designated a Local Nature Reserve called Burton and Chingford Ponds, which is managed by the Sussex Wildlife Trust and West Sussex County Council. The site is adjacent to Burton Park, a Grade I listed building.
Little Wittenham SSSI is a 68.9-hectare (170-acre) biological Site of Special Scientific Interest north-east of Didcot in Oxfordshire. It is also a Special Area of Conservation.
