A scripted invitation bearing the words “at home” is the apogee of British social life.

This magic phrase often means a weekend at a grand country estate. After an indulgent meal, there may be some late-night dancing in a basement disco. After breakfasting off a hangover and enjoying the services of the valet and housekeeper, guests then while away the morning in the ornamental gardens. Best of all, there’s no need to vacate at 11 a.m. or worry about mini-bar charges.