The National Medical Director of NHS England has said this winter's coronavirus and flu cases have been "piling enormous pressure on NHS services that are already very stretched". <br /> <br />Professor Stephen Powis warned of "a lot of uncertainty" over the direction of infection rates, adding that despite planning for a winter spike, the health service will "undoubtedly" continue to feel the strain. Report by Buseld. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn