Prince William's wife had been due to welcome the couple's second child days before their fourth wedding anniversary on Wednesday (29Apr15), but the new baby has yet to arrive.

The Duchess was seen driving her son Prince George to a swimming lesson in London on Tuesday (28Apr15), and officials in the city have now given the clearest hint yet that there will be a long wait for the birth by extending parking restrictions around St Mary's Hospital in Paddington until 5 May (15).

The road-clearing scheme, intended to make the Duchess' journey to the hospital as stress-free as possible, had originally been put in place until 30 April (15).

The couple is reportedly marking their wedding anniversary with a private celebration at home in London.