The late twenties on the cover: fourteen escorts in London aged 25 to 29, favourites already chosen

Ask this chapter where to go and the answers come back precise. Cindy names Scott's and a table with a view of everyone else. Michelle names the martini bar on Carlos Place and will want to know which bitters went into your drink. Thea names Umu, at the counter where the chefs are in full view. Laura names the Guinea Grill, a few doors along Bruton Place, a booth and a good red. Rosa names the Promenade at W1K 1QA, purely for the scones.

Danielle chooses The Fumoir on Brook Street. Karolina starts at St George's, Hanover Square. Samanta books an early recital at Wigmore Hall before supper on South Audley Street. Liana heads for Carlos Place and the dining room of Hélène Darroze, and Patricia for the art books at Maison Assouline.

Milena will hear of nowhere but Sketch. Nora heads for the Piccadilly corner and tries two champagnes rather than one. Tina walks you down Savile Row before a drink on Albemarle Street, and Vanessa settles at the marble counter at Bentley's, just off Piccadilly.

Settled tastes make for easy company over four hours. A companion who already knows the menu can give her attention to you, and one with a real passion, the violin, French novels, sailing, old films, always has a thread to pull when the conversation needs one. For guests who would like a whole weekend of that, the double issue books one companion across two or three days, with a single figure agreed before anything is confirmed.

By figure, the chapter divides fairly evenly. Cindy, Karolina, Liana, Patricia, Samanta and Vanessa carry the long line of slim and slender; Danielle, Michelle, Milena, Rosa and Thea the classic curve; Laura, Nora and Tina are toned and athletic; and Rosa and Tina are petite as well. By shade there are three blondes, three raven heads, one auburn and seven brunettes, the largest group on the page.

For quicker energy and newer discoveries, early twenties is a page back; for a quieter, even more assured presence, thirties and beyond is a page ahead. Height is the other useful filter here, since six of the fourteen also stand among the statuesque.

A first hour in this chapter costs £400, and the rates page carries the rest. Home districts from Chelsea to Covent Garden all sit inside Zones 1 and 2, which means reaching Grosvenor Square costs you nothing extra. Send Bella one name or two and she replies with availability in writing, usually within a quarter of an hour.