In the United Kingdom, an ancient woodland is a woodland that has existed continuously since 1600 or before in England, Wales and Northern Ireland. Planting of woodland was uncommon before those dates, so a wood present in 1600 is likely to have developed naturally.
Whittlewood Forest is a former medieval hunting forest east of Silverstone in Northamptonshire in England. It is managed by the Forestry England. There are tracts of ancient woodland within it and old ditches can be found at the edges of several individual woods. The area has been the subject of extensive academic historical research. An area of 400 hectares in seven different patches has been designated a biological Site of Special Scientific Interest (SSSI), which is about half the size of an average English parish. It is a Nature Conservation Review site, Grade 2.
Long Dole Wood and Meadows SSSI is a 9.8 hectares biological Site of Special Scientific Interest (SSSI) between the villages of Farrington Gurney and Hinton Blewitt in Bath and North East Somerset, notified in 1987.
Lower Woods is a 280.1-hectare (692-acre) biological and geological Site of Special Scientific Interest near the village of Wickwar, South Gloucestershire, notified in 1966 and renotified in 1985. The site area has increased at last revision in 1974 to a 284.1-hectare (702-acre) site. The site is a nature reserve managed by the Gloucestershire Wildlife Trust.
Midger is a 65.7-hectare (162-acre) biological Site of Special Scientific Interest straddling the border of Gloucestershire and South Gloucestershire, notified in 1966 and renotified in 1984. Since the last revision in 1974, the size has been reduced to a 56-hectare (140-acre) site. It lies east of Hillesley, Gloucestershire and north of Hawkesbury Upton, South Gloucestershire. It is at the head of the Kilcott Valley.
Strawberry Banks is a 5.06-hectare (12.5-acre) biological Site of Special Scientific Interest in Gloucestershire, notified in 1993.
Wildwood Discovery Park now known as the Wildwood Trust, is a woodland discovery park in Herne, near Canterbury Kent, England. It features over fifty species of native British animals such as deer, badgers, wild boar, wolves and brown bear. It is located on the main road A291 between Herne Bay and Canterbury.
East Blean Woods is a 151.4-hectare (374-acre) biological Site of Special Scientific Interest south of Herne Bay in Kent. It is also a National Nature Reserve a Special Area of Conservation and a Nature Conservation Review site. An area of 122 hectares is managed by the Kent Wildlife Trust.
Wotton Hill is a hill on the edge of the Cotswold Hills in Gloucestershire, England, 0.5 miles (0.80 km) north of Wotton-under-Edge. The Cotswold Way passes over the hill.
Dymock Woods is a 53-hectare (130-acre) biological Site of Special Scientific Interest in Gloucestershire, notified in 1990. The site is listed in the 'Forest of Dean Local Plan Review' as a Key Wildlife Site (KWS).
Collinpark Wood is a 66.69-hectare (164.8-acre) biological Site of Special Scientific Interest in Gloucestershire, notified in 1966, revised in 1974 and renotified in 1983. There was a boundary change in 1983. There are seven units of assessment. Unit 1 is a 15-hectare (37-acre) area owned and managed by the Gloucestershire Wildlife Trust. The trust purchased this part of the wood in 1979 with grant aid from WWF. The site is listed in the 'Forest of Dean Local Plan Review' as a Key Wildlife Site (KWS).
Bull Cross, The Frith and Juniper Hill is a 42.33-hectare (104.6-acre) biological and geological Site of Special Scientific Interest in Gloucestershire, notified in 1954. The site is listed in the ‘Stroud District’ Local Plan, adopted November 2005, Appendix 6 as an SSSI and Regionally Important Geological Site (RIGS).
Lineover Wood is a 20.3-hectare (50-acre) biological Site of Special Scientific Interest in Gloucestershire, notified in 1986.
East Wood and is a 0.82-hectare (2.0-acre) nature reserve in Gloucestershire, England. The west site is 0.45-hectare (1.1-acre). The east site is 0.37-hectare (0.91-acre). It is part of a larger area of woodland called East Wood, which is adjacent to Oakhill Wood and Woolaston Wood (east). The site was leased from the Forestry Commission in 1986 and is managed by the Gloucestershire Wildlife Trust. The site is listed in the 'Forest of Dean Local Plan Review' as a Key Wildlife Site (KWS).
Siccaridge Wood is a 26.6-hectare (66-acre) nature reserve in Gloucestershire. The site is listed in the ‘Stroud District’ Local Plan, adopted November 2005, Appendix 6 as a Key Wildlife Site (KWS).
South Blean is a 329-hectare (810-acre) nature reserve near Chartham Hatch, west of Canterbury in Kent. It is owned and managed by the Kent Wildlife Trust.
Church Woods, Blean is a 526.7-hectare (1,302-acre) biological Site of Special Scientific Interest north-west of Canterbury in Kent. It is a Nature Conservation Review site, Grade I, a National Nature Reserve, a Special Area of Conservation and part of it is a Royal Society for the Protection of Birds nature reserve.
West Blean and Thornden Woods is a 781-hectare (1,930-acre) biological Site of Special Scientific Interest north of Canterbury in Kent. It is part of the Blean Woods Nature Conservation Review site, Grade I. and an area of 490 hectares is a nature reserve managed by the Kent Wildlife Trust,
Tiddesley Wood – the Harry Green Reserve is a nature reserve of the Worcestershire Wildlife Trust. It is situated about 1 mile west of Pershore and 7 miles south-east of Worcester, in Worcestershire, England. The reserve is an ancient woodland, and is designated a Site of Special Scientific Interest.