Powerboat racer Dan Whapples, who sustained serious injuries in a race incident in Weymouth on Sunday, is showing signs of improvement although he remains in intensive care in Southampton General Hospital . Further updates will be issued in due course.The Royal Yachting Association, the national body of powerboat racing in this country, has confirmed that it will be conducting a full and independent investigation into the incident, and race organiser Powerboat P1 will co-operate fully with the appointed panel.