The Great Hall provides spacious air-conditioned accommodation for presentations, receptions, exhibitions and dinners. It features several works of art, including two glass engravings by David Kindersley which appear over the main entrance. In 1980 Eduardo Paolozzi was commissioned to design a tapestry, which now hangs on the east wall. Three paintings of Buckden Church and Palace, St. David's Cathedral and Conisburgh Castle by John Piper are featured in specially designed sections opposite the main windows.

The Great Hall's refurbishment in 2001 included the installation of a technologically advanced split screen system, which is the only one of its kind in London. The split screen is incredibly flexible. It can be used in a number of different ways, choose to have all three screens working in conjunction with each other, displaying a wide screen panoramic, or each can be used for different images, to highlight a specific point during a presentation. A demonstration of this impressive screen is recommended.