Great Britain has a notably energetic tourist agency: British Tourist Authority, 40 West Fifty-seventh Street, New York, NY 10019-4001/Tel: 212-581-4700. The Cabinet War Rooms, a few hundred feet away from the Houses of Parliament, are open all year round; so, too, is Cliveden, which is a short train ride out of London in Taplow (01-628-668561).