appeared on stage at Manchester's O2 Apollo for the first of two live Q&As as part of The Doing it For Laura events on Saturday.At the gig, he joked about his absence, saying returning to the stage is like "getting in a hot bath".He said: "I've never in my life had a standing ovation when I came on."Peter joked: "I'm going to go away for four more years."The events are being held to raise money for Laura Nuttall, 20, who has an aggressive type of brain cancer called glioblastoma multiforme.Ms