Gentleman's gentleman

Touchwood was by no means critically nice in his society, but was observed to converse as readily with a gentleman's gentleman, as with the gentleman to whom he belonged.

[H]e put it away and, ringing the bell, demanded his valet. . . . In due time came a discreet knock and thereafter a discreet person entered, tall, quick-eyed, low-voiced, soft-stepping, he was a very model of a fashionable gentleman's gentleman.

[H]e estimates that only 50 aristocrats still employ domestic staff (less than the number of London-based Russian plutocrats employing a gentleman's gentleman).