The Club moved from St James’s during World War II, the current clubhouse in Halkin Street (named after Halkin Castle, the Duke of Westminster’s seat in Flintshire) opened in October 1946. Built in 1907 as a private residence for Hugh Morrison by the celebrated architect, Detmar Blow, Number 9 was the last mansion house of its kind to be built in London. The elegant simplicity of the exterior is neatly juxtaposed by sympathetic internal proportions. The Club is constantly evolving in line with membership expectations. A new five-storey wing with terrace garden was officially opened in 2006 by Her Majesty The Queen.