Prince William has been urged to issue an update on wife Princess Kate’s health, as questions surrounding her whereabouts and recovery remain rife. The Princess was spotted on a school run with her mother Carole Middleton, after a US magazine snuck a picture of them together driving in Carole’s car. The Princess of Wales was seen sitting in the passenger seat with sunglasses on just after 9am on Tuesday. The image has sparked further questions and concerns about the royal, forcing Prince William to issue a fresh statement. A spokesperson for the Prince of Wales said: “His focus is on his work …