Jim Kerr believes his childhood stammer led to him becoming the frontman he is today. The Simple Minds singer admitted his speech struggles were a “handicap” at the time but also credits his childhood experiences for making him a good listener and giving him the “vibrant imagination” that has fuelled his songwriting over the years. He said: “The idea of being shy and not wanting to speak and then throwing yourself not only into a band but in the frontline – it doesn’t add up, logically. “As a young kid at primary school, it was really bad. “As a result, I didn’t really speak much at all unless…