British singer Liz Mcclarnon broke down in tears on U.K. TV on Monday (29Apr13) as she took part in a course to beat her crippling fear of flying. The Atomic Kitten star suffers from an overwhelming phobia of air travel and cannot bear to board a plane without downing booze or taking sedatives beforehand. She even received a warning from bosses of a major airline after she "flipped" and demanded to be let off a jumbo jet as it prepared for take-off. McClarnon is now determined to beat her fear before she hits the road with her reunited bandmates for a tour next month (May13), so she agreed to undergo a 'tough-love' course to confront her phobia head-on. She received counselling and advice before being connected to an electrocardiogram machine so experts could monitor her stress responses, but the singer was left weeping and screaming in terror when she was ordered to fly in a light aircraft and her heart rate soared to 213 beats-per-minute. The drama was broadcast on U.K. talk show This Morning on Monday, and McClarnon told viewers, "I have, I would say, quite a severe fear of flying. Several times now I've got on a plane, the doors have shut, we've been taxiing towards the runway and I've actually just flipped and gone, 'Get me off, get me off!' Absolute sheer panic. I think I actually had a complaint from one big airline about that. "When I have absolutely had to fly, then alcohol is involved, or Valium usually. It's the only way I can get on a plane, and that doesn't work any more." Experts monitoring McClarnon recorded that her stress responses revealed she was suffering "pure fear" during the course, and described her case as the "most complicated fear of flying we have ever dealt with". The results of McClarnon's attempts to overcome her phobia will be broadcast later this week (ends03May13).