I must squeeze in to this week the other Open House propoerty I visited. It was completely at random - I passed by and decided to drop in. Seaford House is the "Defence Acadamy" where the army learn how to fight, but the building is rather good, anyway. You can read its history here. Apart from the architecture, it uses jade where other houses use marble, and this spectacular ceiling, you also have the opportunity to sit and take tea, and make believe it's your own house.