Four parking bays in front of the hospital where the Duchess of Cambridge will give birth have been suspended to accommodate her security team and visitors.
An official notice was put up by the spaces in front of the private Lindo wing of St Mary's Hospital in Paddington, announcing the parking ban between 1 - 31 July.
The sign was spotted by Sky News' royal correspondent Paul Harrison, who points out: "Despite speculation that the Duchess' due date is mid-July, the suspension period...only highlights the reality the future monarch could be born at any time."
Four parking bays for the private Lindo wing at St Mary's Hospital in Paddington have been suspended as the Duchess of Cambridge prepares to give birth
An extra night in a deluxe room costs £1,050, plus consultant's fees can come to around £6,000, depending on the care required, meaning a two-night stay can cost more than £12,000.
The Duchess of Cambridge is hoping for a natural birth at the same hospital where Princes William and Harry were born
It has been a popular birthplace for royal children over the years. Peter and Zara Phillips were both born in the wing and Princess Michael of Kent and the Duchess of Gloucester also gave birth there.
Fully refurbished last year, the wing is described as providing "leading private obstetric and neonatal care for 60 years".
Each room has satellite TV with major international channels, a radio, a safe, a bedside phone and a fridge.
Prince William pictured leaving the Lindo Wing at St Mary's Hospital with parents Prince Charles and Princess Diana
The expectant mother and her visitors can access the internet via wifi and there is a choice of daily newspaper delivered to the room each morning. Toiletries are also provided.
All meals are freshly prepared in a dedicated kitchen and tea and coffee is provided for mothers and guests throughout the day.
The wing also offers a "comprehensive wine list should you wish to enjoy a glass of champagne and toast your baby's arrival".