Are you a GBK fan? That means you've probably got the app! Good news, today you have a chance to try their new burger for free. Here's how to get one:

  1. Get down to your local GBK
  2. Open up your GBK app
  3. Show them the offer
  4. Say "Size Matters"
  5. Get a free Big Mouth burger!

I can't wait to try one! There are only 50 available in each restaurant, so make sure you're one of those lucky people. You are only allowed to eat your burger in the restaurant, so no takeaways, unfortunately. 

So, alert all your fellow GBK fans to this exciting offer and keep your fingers crossed that you're one of the lucky 50 to get this delicious looking burger. 

Unfortunately, the offer you were looking for has now expired. Sorry!

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