Friday morning, a "Specialist Search Team" from the Metropolitan Police was seen scouring the area around the private Lindo Wing, where the Duchess of Cambridge is due to give birth to a future king or queen any day now.
The squad team inspected trashcans, plant pots and lampposts around the hospital in a thorough security sweep.
"We are checking the surrounding area," one search officer tells PEOPLE. "It's standard procedure when there is royalty due, and with what's happening here, we have to take extra precaution."
In recent days, a hospital security guard has taken up permanent residence on the steps of the main entrance to the Lindo Wing – here the Duke and Duchess of Cambridge are expected to pose with their newborn baby soon after the birth – with other guards patrolling the area.
"There are about 10 of us in total, but there could be more of us soon," one guard tells PEOPLE.
Publicity stunts help add to the festive atmosphere, such as the arrival of three men dressed as giant babies wearing onesies and prosthetic masks on behalf of a bookmaking firm – Alexandra and George are the current favorite names, while Diana is now at 10-1.
Meanwhile, the game card makers, Top Trumps, are holding twice daily royal baby history lessons outside the main entrance.
"It's crazy," says one staffer who witnessed the media arrive as early as two weeks ago. "But it's fun coming to work and having a look and seeing everyone pose for pictures – they are a very popular couple, so it's exciting for everyone!"
Splash News Online