Happy Boxing Day! Always a festive date in a festive season. But another phenomenon that helps keep that festiveness going all winter are the various cool pop-ups - restaurants, bars, galleries, shops, quirky experiences - always coming along to keep us entertained. Spring brought us all kinds of chocolatey treats and summer had its beach bars, but the chilly season in some ways brings us the most exciting new pop-ups of all. It’s time to get cosy with open…