The Castle can be visited
Donnington Castle

Donnington Castle is a castle ruin near Newbury in West Berkshire, England. It is known for its well-preserved gatehouse with two towers, which was once equipped with a portcullis.
History+
The origins of Donnington Castle date back to the 14th century. In 1386, Richard de Abberbury received permission from King Richard II to build a stone fortification with battlements at this location. It is presumed that a fortified court, possibly a wooden castle, existed here even before. Its strategically favorable position at the intersection of important trade routes made it a point.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 51.4197, -1.3382