The Duchess of Cambridge is thought to have returned to London from her family home fuelling speculation the arrival of the royal baby may be imminent. The Duchess has been dividing her time between her official London residence at Kensington Palace and her parents’ home in Bucklebury, Berkshire. But Sky’s Royal Correspondent Paul Harrison says it is widely believed that the Duchess and Duke of Cambridge have travelled back to London. The Duke is with his wife because he is on annual leave from his job as a search and rescue helicopter pilot. His two-week paternity leave will begin when the baby is born. However, it is unclear whether the couple have gone straight to the private Lindo wing of St Mary’s Hospital in Paddington where Kate is due to give birth, or back to Kensington Palace to sit out the wait. Kensington Palace confirmed the Duchess of Cambridge is due to give birth this month, but has never specified an exact due date. Only 4% of women give birth on their due date. Most women go into labour one week either side of 40 weeks and statistically women pregnant with girls have shorter pregnancies than those having boys. Louise Silverton, of the Royal College of Midwives, told Sky News: “One would presume the Duchess of Cambridge would have had a scan early on in her pregnancy and that’s a very accurate way of determining the size of the baby at that stage. “So I suspect they know pretty much when the baby is due