What Sales Trick Does Belinda's Father Teach for Closing a Client Without Remorse?

At dinner in The Horse and Jockey, Belinda thinks of her father, who spent evenings training her in the wine cellars of central London. His method for getting clients to buy without remorse was to drink very good wine, and a lot of it. Jamie starts to celebrate the line before he has finished reading it. Belinda then eats at her leisure for the first time that day. She feels, briefly, that she is not under pressure, because she is not strapped to a trolley or a bed. The borrowed clothes still fit badly and make her hot. When the meal ends she takes the rest of the wine up to her room in an ice bucket.