Manners at the mansion
Make sure to place your napkin on your lap and not on the table. Watch your hostess for signals on when to eat when she lays her napkin on her lap, and signaling the end, by picking up her napkin and placing it on the table. Never hold your cup with your pinkie finger extended. This is improper and in most social settings is considered rude.
If seated at a table, do not lift the saucer (this is only proper if standing; then lift the saucer with the cup). When you are taking a sip of tea, do not look around but lower your eyes so you can see what you are doing and not spill your tea. Do not dine with gloves on and never sip or slurp tea. Leave your napkin on the chair, not the table, if you must leave the table. When you are ready to leave, you simply thank your host and say goodbye to the guest of honor.