Our friends at Gourmet Burger Kitchen have your Blue Monday cure, and it's burgers. FREE burgers! This Monday Jan 16 every GBK in the UK mainland will be giving away 50 free lunch menus on a 1st come, 1st serve, eat in-only basis. Just turn up, show your Customer ID on the GBK app on your phone & voila! Lunch, on them. So ditch the gym & get your meat HIIT this Monday.