Towering tribute to future monarch
As the nation waits for the birth of the royal baby one thing can be certain: news of the Duke and Duchess of Cambridge's new arrival will light up London.
The BT Tower, a landmark in the capital since the 1960s, will display the royal birth announcement - when the moment finally arrives.
Soon after the baby is born people in central London will be informed whether William and Kate have had a boy or girl.
Standing more than 600ft tall (183 metres), the telecommunications building can be seen from the suburbs - although royal fans will need sharp eyes to read the announcement on the LED screen.
The Duchess has been dividing her time between her official London residence at Kensington Palace and her parents' home in Bucklebury, Berkshire.
A Kensington Palace spokesman said: "The same as any expectant parents would be, they're now spending their time privately."
The Duke is with his wife because he is on annual leave and his two-week paternity leave will begin when the baby is born.
A due date for the birth has never been officially confirmed by the Palace, only the month of July was given at the start of the year.
Suzi Williams, director group marketing and brand at BT, said: "As one of London's best-loved landmarks, it's only fitting that the BT Tower should celebrate when the city celebrates. Since the LED screen at the top was first installed back in 2009 it has counted down from 1000 days to the start of London 2012, and commemorated the Royal wedding and the Diamond Jubilee. We're excited to be sharing news of the royal birth too."
Bookmaker William Hill is offering odds of 4/6 that the royal baby will be delivered over the weekend. The betting on names is still weighted towards long-term favourite Alexandra (6/4) if it is a girl and George (8/1) for a boy. A spokesman for the firm said bets had been coming in from as far afield as Iceland, the Cayman Islands, Venezuela and Mauritius. The last time the company had such a busy international market was during the 2010 football World Cup. William Hill spokesman Rupert Adams said: "The odds suggest the wait could finally be over and we expect a rather special royal delivery over the weekend."