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Bisham Abbey is a Grade I listed ( Link ) manor house at Bisham in Berkshire. The name is taken from the now lost monastery which once stood alongside. This original Bisham Abbey was previously named Bisham Priory, and was the traditional resting place of many Earls of Salisbury. The complex is now one of five National Sports Centres run on behalf of Sport England and is used as a residential training camp base for athletes and teams and community groups alike. It is also a popular wedding venue with a license for civil ceremony and is increasingly popular for conferences, team building events, corporate parties and private functions.
Wikipedia: Link
Website: Link

Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link