Susan Boyle’s jaw-dropping audition on Britain’s Got Talent is one of the talent show’s most memorable moments – however, creator and judge Simon Cowell has admitted that it was a “wakeup call” for him on how he treated contestants. Scottish church volunteer Boyle , now 65, auditioned on the ITV show back in 2009, initially being sniggered at by judges Cowell, Amanda Holden and Piers Morgan after telling them that she hoped to be as successful as Elaine Paige. However, she immediately blew them away with her stunning rendition of “I Dreamed a Dream” from musical Les Misérables. Speaking about the audition 17 years on, Cowell said that his reaction to Boyle walking on stage was “awful”. Susan Boyle in her first audition for Britain's Got Talent in 2009 (ITV) “But actually, I remember saying, I don't think we look bad enough. I think we were even worse than that,” he told the podcast, Tales from the Celebrity Trenches on Wednesday (6 May).…