and potentially even dying. oxygen is one of the most common treatments given in medical emergencies, and doctors stress accurate readings are vital when assessing patients. nhs england say they are keeping the situation under review and have commissioned further research into the issue. amara sophia elahi, bbc news. now on bbc news, zeinab badawi talks to two of today's biggest 0pera names — italian mezzo soprano cecilia bartoli and tenorjuan diego florez. i've been an opera fan for decades and i want to share my passion with you so i'm on a mission to tell you about some of the names in opera who are making it fit for the future. superstar cecilia bartoli is the italian mezzo soprano who originally wanted to be a flamenco dancer. and peruvian born tenor juan diego florez is an icon but he wanted to become a pop star. big names today — but are they prepared for