The Knightsbridge Clubhouse is a haven for those who want a relaxing and exclusive land base in London. In common with other leading London Clubs (originally all called "Gentlemen's Clubs"), the Royal Thames started in a coffee house and the Club's dining room is still called the "Coffee Room". There are also bars, reading rooms and cabins for those staying in London.

A friendly welcome, fine food and comfortable accommodation is guaranteed. The Club has a distinguished cellar and a tradition of serving superb wines at reasonable cost. There is a wide range of social events for members, all summarised on this website.

The Clubhouse is also available for many different types of function. Each must be sponsored by a member, which can be arranged through the Club Functions Manager.  Functions are generally held in rooms overlooking Hyde Park and may be on a large scale or small, ranging from private meetings, dinners and lectures to class association gatherings, wedding receptions and bigger corporate dinners for up to 174.

Members and guests are expected to maintain a standard of dress in conformity with the tradition and atmosphere of the Club.  ‘Business Casual’ is appropriate throughout the Clubhouse at all times except during weekday evenings after 7pm on the Quarterdeck, in the Cumberland Bar and Coffee Room dining room as specified below. 
The minimum dress code throughout the public areas of the Club is smart casual. Gentlemen should wear collared shirts. T-shirts, dirty torn or distressed clothing, workman's jeans, sandals and sportswear are not acceptable. Members and guests are encouraged to dress with the style and elegance appropriate to a club of our excellence and standing.
H 1.4a After 1900 Monday to Thursday gentlemen are required to wear a jacket and tie on the Quarterdeck, in the Cumberland Bar, in the Coffee Room restaurant and in the other public rooms on the first floor. Ladies should dress appropriately.
 H 1.4b Residents taking exercise outside the Club may wear sports attire when going from and to their cabins.
 H1.4c The Committee may further relax this Bye-Law in respect of a particular event taking place within the Clubhouse. H1.4d The Chief Executive/Club Secretary is authorised to relax the dress code if the ambient temperature dictates this to be appropriate.
 H1.4e The Chief Executive/Club Secretary, or any other person authorised by the Committee, may request any Member, guest or visitor whose attire falls short of this code to remedy their dress appropriately, or, in extreme cases, to leave the Clubhouse.