It used to be that you had a simple choice when buying a beer - VB or NEW! And for those that felt adventurous, there was - XXXX. Now, whether it's at the bottle shop or the pub we're dazzled by a blinding array of craft beers. So what's behind this explosion of creativity in brewing and how does a punter make a choice? Murdo Mac spoke to International Craft Beer judge and local brewing entrepreneur, Lachlan McBean from GrainFed Brewing…