LONDON – Prince William says he is concerned about the mental health of U.K. ambulance drivers, police officers and other first responders who are being exposed to extraordinary levels of trauma and death as coronavirus cases soar.William, a former search and rescue helicopter pilot, told emergency workers on a video call that they must not be afraid to ask for help despite their inclination to help others first.“I fear…you’re all so busy caring for everyone else that you won’t take enough time to care for yourselves, and we won’t see the impact for quite some time,’’ William, the second in line to the British throne, said on a tape released late Friday.Britain’s health care system is staggering as a more contagious variant of the.