As no one has outlined the actual ettiquette yet, this is how it goes;
1) Present your business card on an appropriate (ideally silver, pewter is acceptable in damp conditions) platter (assuming your butler is unavailable to present it for you).
2) Await a reciprocal card from your new acquaintance.
3) If no such response is forthcoming, apply the harshest measures, including, but not limited to;
- Pretending not to hear when asked to pass the port
- Not inviting this ruffian into the library for cigars and brandy
- If they should call, having your footman tell them that you are out, while you audibly play the piano-forte to give the lie to this statement
- Sending all correspondence to this incorrigible cad with the postage stamp affixed upside down.
Note that peers of the realm, and minor royalty will expect to acknowledge you *first*, and to present your card to such a person before being invited to would be an awful faux pas; in such cases, you may need to emigrate to the colonies until the offence is forgotten.