The oval-shaped Library is the venue’s most spacious room seating up to 130 and characterised by a minstrel’s gallery which can accommodate a full chamber orchestra. Natural light floods the room through tall south-facing sash windows offering a direct view of the Tower of London. There are fine 16th and 17th Century stained glass windows and two impressive chandeliers plus a fascinating collection of antique silverware in a glass cabinet showcase. Included in the display is a magnificent wine cooler presented to the House by William IV; a silver salt in the form of Winstanley's Eddystone Lighthouse made in 1880, and several alms dishes from the 17th Century.

While its collection of rare books is safely protected behind the room's panelled doors, The Library is also home to several arresting portraits including those of Earl Mountbatten, HRH Prince Philip, (the former Master of the House); Sir Winston Churchill, Charles II and the Duke of Albermarle. The rooms elegant proportions and dramatic views make it a uniquely English setting for important events and celebrations.