Tennent's has announced a second run of its highly sought after Christmas advent packs after the first lot sold out in just five hours.The popular Glasgow-based brewer launched the ‘extremely limited’ set of gift packs on November 23.However, after incredible demand, they've decided to add a second, and they say final, run which fans can pre-order now.The special calendar will again be available to order from the Tennent’s website, priced at £25.The firm decided to give beer fans the chance to