St James's, SW1A and SW1Y, three minutes from the park gates

SW1A 1NJ sits at the closed end of a lane off St James’s Place, with a cellar under it that was used as an air raid shelter and now holds wine. SW1A 1NY is around the corner in a courtyard with about four parking spaces and a bar that makes its martinis from a trolley. Both are quiet enough that an arrival is a private event by architecture rather than by arrangement.

SW1Y 6JF sits on Jermyn Street above the shirtmakers, and SW1Y 4AN fills a former bank on the Waterloo Place corner, its lobby set under a glass dome. W1J 9BR is two minutes west. None of these hotels is connected to this desk in any way, and none has been approached.

Green Park is three minutes from the middle of the quarter and carries the Jubilee, Piccadilly and Victoria lines, which makes it the quickest arrival from the north, west or south. Piccadilly Circus is five minutes east on the Bakerloo and Piccadilly. St James's Park is six minutes south on the Circle and District.

Walking here beats driving by a clear margin: half the streets are one way, several of the courtyards cannot be driven into at all, and the distance from any station is shorter than the queue for a cab. A companion generally reaches an SW1Y door within thirty minutes of the desk confirming, and inside twenty when she starts in W1.

This district does the pre dinner drink better than anywhere else in the zone and then largely stops. The bars fill between half past six and half past seven, empty as people go to their tables elsewhere, and fill again briefly at eleven. Booking against that pattern is simple: start at half past six if the plan is a drink and a table, or at eleven if the evening has already happened somewhere else.

Ninety minutes at £400 fits the first of those. Two hours at £500 covers a drink and a dinner nearby. Three hours at £700 is the length for an evening that begins in one of the courtyards and ends in another.

St James's Street and Pall Mall carry a number of private clubs, and each sets its own rule about guests. Some admit them without question, some only before a particular hour, and a few not at all. That is the club's business and yours to check, not something this desk will guess at.

Where there is any doubt, the sensible arrangement is that she waits in a hotel bar nearby and you collect her, or you meet there afterwards. Nobody is left standing at a door in this quarter, which is a small thing that turns out to matter.

People three or four nights into the small hotels here, who like the scale of the quarter and dislike a lobby with a queue in it. People in town for something at one of the auction houses or the galleries on Bury Street. Visitors with an obligation in SW1 the following morning who want a proper evening first.

Bookings run slightly earlier than in Soho and slightly longer than in Holborn. The dinner date at £900 does well here, because the district gives you a drink, a table and a walk within four hundred metres.

Lea likes old rooms and older restaurants and is ten minutes over from Belgravia. Stacy is composed at twenty two in a way most people manage only after a decade of practice, and comes across from Chelsea in twenty minutes.

From either side, Cindy prefers an early table and a short walk, Vanessa is the one for a courtyard glass and a late view, Margo is fifteen minutes in from Knightsbridge and formal in the best sense, Samanta walks down from Mayfair in eight, and Luna does the same walk and is the most striking arrival on the list. The rest of On The Books reaches this quarter on the same figures.

Give the hour, the length, the building and a name. The desk is staffed at every hour and answers within ten to fifteen minutes on WhatsApp or Telegram, with the arrival time in the reply. Her fee is handed to her in person once she is in the room.

One check follows the confirmation: the name the booking is held in, the hotel and the room number, matched once and used for nothing afterwards. For a courtyard address it is worth saying which entrance, since two of the hotels here have doors that are easy to walk past.

North across Piccadilly the ground rises into Mayfair within five minutes of the Piccadilly corner. The avenue itself is set out at Piccadilly. South east past Waterloo Place the government quarter begins at Westminster, about eight minutes on foot. North east through the Circus, the theatres and then Soho are ten minutes away. Green Park, Piccadilly Circus and Charing Cross all sit on the edges of this district, and the zone as a whole is drawn on the Central London page.