The Duchess of Cambridge's baby is due as early as today, it has been revealed. According to one well-placed source, Kate's real due date is today or tomorrow - which would tie in with comments made by the Duchess herself. Speaking during an engagement in London last month, she said that her second child is due 'mid to late April'. Scroll down for video . Due today? The Duchess of Cambridge revealed her baby is due 'mid to late April' during a visit last month . Kate, 33, who was touring the Stephen Lawrence Centre in Deptford with Prince William, added: 'Not long to go now.' Although April 25 is widely thought to be the Duchess' due date, royal sources point out that it has never been officially confirmed as such. 'We haven't ever confirmed a due date,' a Kensington Palace source told MailOnline. 'The Duchess herself said mid to late April and there have been plenty of dates bandied around in the media but we've never confirmed anything and we never will.' However, the 25th remains a favourite with punters according to bookmakers Ladbrokes, although tomorrow and Friday are also popular and are priced at just 6/1. The Duchess is currently thought to be staying at Kensington Palace, a short drive from the Lindo Wing at St. Mary's Hospital where she is due to give birth. Popular: The 25th is the favourite but the Palace says neither that date or any other has been confirmed . Preparations: The police were seen making final checks ahead of the birth outside the Lindo Wing yesterday . Yesterday, police could be seen searching the area in preparation for the Duchess' arrival and were seen peering under traffic cones and taking lamp posts apart. According to a statement released by Kensington Palace the same day, the new baby's father, Prince William, has  finished his Air Ambulance training early and will now avoid the two-hour dash from Norfolk that some had predicted. 'The Duke of Cambridge has completed the first phase of his in-work air ambulance helicopter pilot training with Bond Air Services earlier than anticipated,' the statement read. 'This is due to a combination of The Duke performing well in the various modules and having very good flying conditions that allowed flight training and assessment to progress more quickly than had been planned. 'As he now will not have any further training to complete after returning from paternity leave, he will not return to duties with Bond until that time, and will remain on unpaid leave until then.' Fans: Royal fans have also set up camp outside the hospital, among them Terry Hut, 71 . Ready to go: The scenes outside the hospital are reminiscent of those seen for Prince George in 2013 . Back in town: The Palace has said Prince Harry will be in London this weekend before returning to Australia . But concerns have been raised about the possibility of the royal birth clashing with official events to mark the centenary of the Dardanelles campaign, with Prince William due to attend a wreath-laying service at the Cenotaph on Saturday. The ceremony, which is also being held to mark ANZAC Day, will be mirrored by another taking place in Turkey which is due to be attended by the Prince of Wales and Prince Harry. Kensington Palace have also said that rather than return directly to Australia, where he is currently taking part in training exercises with the Australian Defence Force, Harry will briefly travel back to London instead. Harry will attend Sunday's London Marathon, which, according to Palace sources, is a long-standing commitment but one that could  be confirmed only after  his Australian army schedule had been firmed up.
Sources have hinted that the Duchess' real due date is today or tomorrow .
The Duchess herself has said that her due date is 'mid to late April'
Although the 25th is favourite, the Palace says no date has  been confirmed .
Prince William is due to be at the Cenotaph for ANZAC Day on Saturday .
Prince Harry will also be in London this weekend for the London Marathon .