By Rosaleen Fenton Prince William is stepping back from official duties while Kate Middleton remains in hospital and during the immediate days after. The Princess of Wales is being treated in hospital after undergoing successful abdominal surgery, Kensington Palace revealed today. Kate, 42, was admitted to The London Clinic on Tuesday for the planned procedure. The future Queen is set to remain in hospital for 10 to 14 days before returning home to continue her recovery. The Princess is likely to spend between two and three months recuperating and is not expected to return to public duties unt…