Britain’s Got Talent act Harrison Pettman is taking his chances on sacking off his day job and becoming a singer this Spring. Standing on stage in front of the BGT judges, Harrison explains how he currently works as a security guard and a youth worker. But, his future could look very different following his rendition of With You from Ghost the Musical. Twenty-two-year-old Harrison stepped out on the Britain’s Got Talent stage to surprise his family in the audience. His parents, Nan, and brother were all watching. He said they had no idea he was going to be performing, but fans have their suspi…