Found 5th Sep 2016
Hey guys I was in BK this morning & bought a 99p cheeseburger so that I could use the wifi free for 3 hours. The dude gave me my receipt and I had to fill out a short survey online - then I could get a free Whopper when I bought regular fries and regular drink (diet Coke in my case). You get a code from the survey, write it on your receipt then claim your free Whopper! I think you could get a Chicken Supreme instead if you are vegetarian & don't like meat.