Since 1456 there has been a Mansion House within the confines of what was known as the Manor of More.  In 1631 the 4th Earl of Pembroke sold off the land in two lots with the Manor being purchased by Sir Charles Harbord, and the Park by the Earl of Monmouth.  In 1670, Charles II's illegitimate son, James the Duke of Monmouth, commissioned the house that is on the site today and, once completed, he demolished the House that was frequented by Henry VIII, Anne Boleyn and Cardinal Wolsey.

In 1720 Benjamin Styles bought the House from the widow of the Duke of Monmouth, and it was he that extended it and commissioned the paintings that are still within the Mansion House today. After his death Lord Anson acquired the estate and commissioned Capability Brown to landscape the gardens.  In the mid 1800s, Robert Grosvenor, the first Lord Ebury, who at this time owned the Park, purchased the Manor, thus reuniting the Manor with the Park.

In 1923 Lord Leverhulme purchased the property from Lord Ebury and charged Harry Colt with the task of creating three golf courses, the East, West and High.  In 1937 the local Council purchased the estate and turned the East course into what is now known as the Rickmansworth Municipal Golf Course.  As a result of this, the West course was altered to the way that it is today.

During the last war, the Armed Forces were based in the Mansion House and it was in what is now known as the Arnhem Room, that the infamous Battle of Arnhem was planned. The battle was depicted in the film "A Bridge Too Far" and, as the Parachute Regiment was very much involved in the action, the room is home to memorabilia from many of the actions that have involved this famous regiment.

The members purchased the estate from the Council in 1994, and we are very pleased to advise that all of our historic rooms have now been completely refurbished and all our paintings restored to their original splendour.