“Shall we dance?” Joe Talbot asks towards the end of a 60 minute set. He’s a bit late. As late as the person wearing the “Free Nelson Mandela” t shirt that’s he’s spotted in the crowd earlier on.  The dancing started from minute 1.  48 hours ago, nobody knew this was happening. Yet now, on Thursday night, Project House is packed with fans and more queuing outside to get in amongst it and hear tracks from Idles’ latest offering Tangk, produced by Nigel Godrich (Radiohead, Beck, Paul McCartney) It’s the first of 2 sell-out shows this evening. The band stalked on to the stage in near darkness, a veil that…