The fair-haired four, introduced by name near Albemarle Street

Cindy is 168 cm, slim and blue eyed, and lives in Chelsea. Her mornings begin on a yoga mat and her summers on the water, and the small camera in her bag waits all day for the one frame she decides to keep.

Nancy, 170 cm, curvy and blue eyed, lives in Covent Garden and is the one of the four in her thirties. She likes long drives with no fixed route. Her single extravagance is sushi.

Nora, 166 cm, athletic and hazel eyed, trained in fashion design and studies how a coat is constructed before she studies the person inside it. Grower champagne is her weakness. Home is Paddington.

Thea, 165 cm, curvy and green eyed, walks the Chilterns at weekends and crosses London by bicycle whatever the forecast. Japanese food is her enthusiasm. She lives in South Kensington.

Cindy asks for a table by the tall windows of Hide on Piccadilly, facing Green Park, and watches the trees darken between courses. Nancy wants stools at the counter at Nobu on Berkeley Street, in Mayfair, near enough to follow the knives. Nora starts under the glass roof of the Burlington Arcade, a few steps from Albemarle Street, and expects a glass of something sparkling soon after. Thea takes a stool at the Kiku counter, just off Piccadilly, and leaves the ordering to the chef.

Conversation is the real reason to choose between them. Cindy talks about wind, light and the single photograph she kept today. Nancy talks about coast roads, cold water and a sushi counter in some other city. Nora talks about seams, small champagne houses and the flower market on a Sunday morning. Thea talks about chalk ridges, rice and the quiet back routes between one postcode and the next.

Three of the four are at their happiest outdoors, which makes this a sensible page to begin from when the arrangement is a daytime one: lunch, an afternoon at the Royal Academy, a slow circuit of St James's Park before the light goes. Tell Octavia the hour and the weather you are hoping for. She will say which of the four would enjoy that plan most, and why.

Nancy and Thea are also curvaceous. Cindy appears under slim and slender, and Nora under toned and athletic. By decade, Cindy, Nora and Thea sit in the late twenties, while Nancy belongs to thirties and beyond.

Each begins at £600 for the hour, and the ladder continues on rates. Nora and Thea are two of the names Octavia puts forward for extended engagements, which run from a weekend at £6,000 to several evenings across a longer stay. Send her a name and an hour through booking, or tell her what the evening is and leave the choice among the four to her.