<p><br /> Fans at London's O2 were left disappointed at Whitney Houston's concert on Sunday night, as the star was forced to apologise for her singing.<br /> </p><p><br /> The 46-year-old, who is on her first tour of Britain in a decade, struggled through some of her best known hits.<br /> </p><p><br /> "She doesn't want to come, my soprano friend," said the star, explaining her voice.<br /> </p><p><br /> "Sometimes the old girl sings, but not tonight," Whitney told the crowd. "I want to do it, but she doesn't want to ... She's getting a little temperamental," she added.<br /> </p><p><br /> The diva also had another excuse for her performance. "Turn the air-con off," she asked organisers, from the stage. "I can feel it. It takes away my soprano."<br /> </p><p><br /> It is claimed some fans were so unimpressed by the star's comeback gig, they walked out.<br /> </p><p><br /> But those who attended the star's Monday night show, also at the O2, had a different tale to tell. Many concert-goers said they thoroughly enjoyed it.<br /> </p><p><br /> The first three dates of Whitney's UK tour in Manchester and Glasgow had to be postponed as she was suffering from a respiratory disorder. Whitney is due to perform again on May 1 in Glasgow and in Manchester on June 16 and 17.<br /> </p>
