There are two Biffy Clyros. The first Biffy was adored by fans of Hell Is For Heroes and Hundred Reasons for their complicated, aggressive and emotive underground alt-rock. But that’s not the Biffy we see tonight, playing to 13,000 people off the back of a number one album. This is Biffy 2.0, and if you’re a new fan, this will be your gig of the year. If you’re an old fan, though, you’re going to have to accept that Biffy are no longer the band you fell in love with.